PTO Brief Argues Why PTAB Can Issue Decisions On Remand From FedCir

Under the America Invents Act IPRs are supposed to be completed with a final written decision no later than a maximum of 18 mos after institution. But if the FedCir remands for further findings on appeal can the PTAB issue a decision on remand past the 18 mos? “Yes” says the USPTO, and in a recent brief it argues why it can:

Posted in America Invents Act, Federal Circuit, remand to PTAB, Uncategorized | Tagged , , , , , , , , | Leave a comment

Complex Claim Construction Issues in Knowles Electronics v. Cirrus Logic

A recent Federal Circuit case demonstrates the complexity of resolving difficult claim construction issues in multiple agency and court proceedings.  In Knowles Electronics v. Cirrus Logic the Federal Circuit declined to apply its own prior claim interpretation of the same term of the same claims of the same patent.

U.S. Patent No. 6,781,231 (“the ’231 patent”) entitled “Microelectromechanical System Package with Environmental and Interference Shield,” was issued to Knowles Electronics, LLC (“Knowles”) in 2004.  The ’231 patent discloses microelectromechanical system (“MEMS”) packages comprising a substrate, a microphone, and a cover accommodating the microphone. The MEMS packages shield the microphone from an interference signal or an environmental condition,  and improve over the prior art’s drawbacks associated with manufacturing these housings, such as lead time, cost, and tooling.

Independent claim 1 is illustrative of the invention and recites:

A microelectromechanical system package comprising: a microelectromechanical system microphone;
a substrate comprising a surface for supporting the microelectromechanical microphone;
a cover comprising a conductive layer having a center portion bounded by a peripheral edge portion; and
a housing formed by connecting the peripheral edge portion of the cover to the substrate, the center portion of the cover spaced from the surface of the substrate to accommodate the microelectromechanical system microphone, the housing including an acoustic port for allowing an acoustic signal to reach the microelectromechanical system microphone wherein the housing provides protection from an interference signal.

Three inter partes reexaminations were filed by Cirrus Logic, Inc. (“Cirrus”) against the ’231 patent and were later merged. (U.S. Control. Nos. 95/000,509, 95/001,251, and 95/001,363).  Ultimately claims 1-4 and 23-27 were reexamined and rejected based on anticipation in view of van Halteren (WO 01/414497 A1) and for lack of written description.  Knowles appealed the rejections to the Patent Trial and Appeal Board (PTAB).

On appeal to the PTAB, different claim construction arguments were proffered by Knowles, including one that the PTAB should adopt an interpretation of “package” in the preamble based on a prior decision in an International Trade Commission (ITC) proceeding which was considered and upheld by the Federal Circuit in MEMS Tech. Berhad v. Int’l Trade Comm’n, 447 F. App’x 142 (Fed. Cir. 2011).  Under this definition, Knowles maintained, van Halteren would not anticipate the claims.

But the PTAB declined to apply the Federal Circuit’s prior decision construing the same term of the same claims of the same patent, concluding that the Board was not bound by the district court’s claim constructions.  PTAB Op. *12 (citing In re Trans Tex. Holdings Corp., 498 F.3d 1290, 1301 (Fed. Cir. 2007) (“We conclude that the Board was not bound by the district court’s claim construction. . . .”)).  The PTAB affirmed the examiner and upheld the rejections.

After a failed request for rehearing, Knowles appealed the decision to the Federal Circuit. Knowles argued “[t]he [PTAB] should have read MEMS Technology and concluded that a ‘package’ requires a ‘self-contained unit[’] . . . and that this unit must be ‘mountable.’”   Knowles’ position was that the PTAB has an obligation to “evaluate a previous judicial interpretation of disputed claims and to determine whether it is consistent with the [BRI] of the term.”

The panel majority (Judges Wallach and Chen) did not consider whether the PTAB was bound to apply the Federal Circuit’s decision in MEMS Technology, but explained that it not agree that the PTAB’s claim construction conflicts with MEMS Technology:

In MEMS Technology, we upheld the International Trade Commission’s construction of the term “package” in the ’231 patent’s preamble to mean “a self-contained unit that has two levels of connection, to the device and to a circuit (or other system).” 447 F .App’x at 159; see id. (affirming the ITC’s rejection of an anticipation claim because the disputed prior art “does not disclose first and second levels of electrical connection”).

Thus, the claim construction in MEMS Technology did not require that a package be mounted via surface or through-hole mounts, such that even if we were to look to MEMS Technology, we would find no inconsistency with the PTAB’s construction of the claim term “package” here.

Consequently, the panel majority affirmed the PTAB’s decision on unpatentability.

Judge Newman dissented:

I write in concern for perpetuation of the erroneous position that the PTAB need not apply the prior final judicial decision of the same issue of the same claims of the same patent. [] This error not only produces an incorrect result in this case, but will further impart uncertainty to proceedings under the America Invents Act. The purpose whereby the PTAB was created as an agency tribunal, in order to provide stable law and economical determination of patent validity, is negated when final adjudication in a court of last resort may be ignored, and the issue litigated afresh in the agency tribunal.

Judge Newman invoked B & B Hardware, Inc. v. Hargis Indus., Inc., 135 S. Ct. 1293, 1303, 1305–06 (2015) for the proposition that a prior judicial decision resolving the same issue is accorded preclusive effect not only in subsequent court proceedings but also before an administrative agency, subject only to the established equitable and due process exceptions to preclusion.  She faulted the PTAB for adopting the opposite position and the majority for ignoring that part of the PTAB’s decision:

However, the PTAB stated that “precedent makes clear that the USPTO is not bound in reexamination proceedings by claim constructions produced by a court.” PTAB Op. *12. While precedent has previously addressed the effect of a prior district court claim construction on a subsequent PTO proceeding, never before has a final claim construction by this court been held not to be preclusive.

Here the claim construction was decided by the Federal Circuit, as a matter of law, in MEMS Technology Berhad v. International Trade Commission, 447 F. App’x 142 (Fed. Cir. 2011). No equitable or due process exception to issue preclusion is here asserted; thus preclusion should apply. The majority declines to discuss this question, which is presented on this appeal. By this silence, my colleagues are reinforcing this incorrect position. I respectfully dissent.

Judge Newman observed that the majority based its decision partly on the Power Integrations case.  She distinguished the instant case (involving a decision from the Federal Circuit) from Power Integrations, because Power Integrations involved only a district court decision, thereby allowing the Board not to be bound to a district court claim construction.

These decisions are complex because there are two claim construction standards at play (BRI v. the narrower Phillips district court construction), different deciding bodies (PTO, district court, PTAB, ITC, and Federal Circuit), and different proceedings (district court trial, appellate review, ex parte examination, ex parte reexamination, inter partes reexamination, inter partes review, ex parte and inter partes appeals).  With these differences there are no easy analyses and distinct and definitive lines of issue preclusion are hard to draw.

Posted in America Invents Act, BRI v. Phillips Construction Issues, Broadest Reasonable Interpretation standard, claim challenges, Claim Construction, Claim Preclusion, Federal Circuit Review of PTAB Proceedings, inter partes reexamination, Issue Preclusion, ITC, prior art, PTAB, reexamination generally | Tagged , , , , , , , , , , , , , | Leave a comment

PTAB Expanded Panel Decides Sovereign Immunity Is Waived For District Court Patent Assertions by State Entities

Sovereign immunity has been a topic of great debate ever since the Patent Trial and Appeal Board applied it to dismiss inter partes reviews (IPRs) involving state owned patent rights.  In Covidien v. University of Florida Research Foundation the Board dismissed three IPRs based on sovereign immunity.  (IPR2016-01274, -01275, -01276.)

Other universities caught wind of the Covidien decision and invoked their own sovereign immunity defenses to attempt to avoid IPRs of their patents.  For example, the University of Minnesota asserted the sovereign immunity defense in its IPR battle with Ericsson.  Ericsson v. Regents of the University of Minnesota, IPR2017-01186, -01197, -01200, -01213, -01214, and -01219.

The University of Minnesota filed a motion to dismiss the Ericsson IPRs based on sovereign immunity.  Ericsson opposed the motion, but did not dispute that the University could claim sovereign immunity as a state entity.  Ericsson and the University had a basic difference of opinion about whether sovereign immunity could be a valid defense in IPRs.

On December 19, 2017 an expanded panel of seven administrative patent judges of the Patent Trial and Appeal Board decided that while sovereign immunity applies to state entities, such as the University of Minnesota, it is waived when a state entity files an action in civil court claiming patent infringement:

We agree with Petitioner [Ericsson] that the filing of an action in federal court alleging infringement effectively waives Patent Owner’s Eleventh Amendment immunity defense.

The majority of the Board denied the University’s motion to dismiss the IPRs based on sovereign immunity because the University had filed suit in district court, waiving its sovereign immunity defense.

A concurring opinion was authored by Judge Jennifer S. Bisk, where she concluded that sovereign immunity was not a defense for use in IPRs based on the differences between IPRs and district court proceedings.  Therefore she reached the same end result that sovereign immunity does not apply here, but for different reasons.

With this ruling the University of Minnesota will be back to work on these IPR proceedings unless it can find a way to request interlocutory relief from this decision.

Posted in inter partes review, motion practice, PTAB, serial petitions, States rights and sovereign immunity, Uncategorized | Tagged , , , , , , , , , , | Leave a comment

PTAB Boardside Chat Provides Statistics About Multiple IPR Petition Filings

On October 24, 2017, PTAB Chief Judge David Ruschke and Lead Judge William Saindon conducted a webinar covering filing statistics for IPR petition filings, and in particular how multiple petitions have fared statistically in the PTAB.  They also announced three informative decisions relating to the 35 USC § 325(d) issue:

  • IPR2016-01571 – Unified Patents, Inc. v. Berman
  • IPR2017-00739 – Hospira, Inc. v. Genentech
  • IPR2017-00777 – Cultec, Inc. v. Stormtech LLC

The slides of the October Boardside Chat can be found here.

Some of the takeaways from the October Boardside Chat are:

  • The PTAB wants each petitioner to explain why it filed a subsequent IPR petition, and will be especially careful about petitions filed after a decision on institution.  (See the informative decisions, above.)   This is to avoid the situation where a petitioner uses a first petition as a “roadmap” to make a subsequent petition filing.
  • Petitioners need to review the following seven factors and the precedential General Plastics decision (General Plastic Industrial Co. v. Canon Kabushiki Kaisha, IPRs: 2016-01357, 2016-01358, 2016-01359, 2016-01360, 2016-01361)
      1. whether the same petitioner previously filed a petition directed to the same claims of the same patent;
      2. whether at the time of filing of the first petition the petitioner knew or should have known of the prior art asserted in the second petition;
      3. whether at the time of filing of the second petition the petitioner already received the patent owner’s preliminary response to the first petition or received the Board’s decision on whether to institute review in the first petition;
      4. length of time that elapsed between the time the petitioner learned of the prior art asserted in the second petition and the filing of the second petition;
      5. whether the petitioner provides adequate explanation for the time elapsed between the filings of multiple petitions directed to the same claims of the same patent;
      6. finite resources of the Board; and
      7. requirement under 35 U.S.C. § 316(a)(11) to issue a final determination not later than 1 year after the date on which the Director notices institution of review.


      Judge Ruschke invited stakeholders to provide feedback and further questions for any other statistical information that might be of use for the patent bar to advise its clients.  It was clear from the tenor of the discussion that the PTAB wanted to set the record straight on serial IPR petition practice, and to quell some the concerns raised by certain commentators about heavy-handed post-grant proceedings using multiple IPR petitions.


Posted in America Invents Act, Boardside Chat Report, inter partes review, IPR, serial petitions, Uncategorized | Tagged , , , | Leave a comment

10 Minute Webinar on IPR Claim Amendments In View of Aqua Products

If you are interested in knowing more about amendments in IPR proceedings and the practical impact of the Federal Circuit’s en banc Aqua Products decision, click here to view a brief 10 minute presentation.

Posted in Aqua Products, Federal Circuit Review of PTAB Proceedings, inter partes review, Motion to Amend, PTAB, Uncategorized, Webinar | Tagged , , , , , , , | Leave a comment

Federal Circuit’s Aqua Products Decision Clarifies Burden on IPR Petitioner to Challenge Amended Claims

On October 4, 2017, the Federal Circuit issued a lengthy decision in Aqua Products v. Matal, spanning five opinions and 148 pages, which addressed the proper allocation of the burden of proof when amended claims are offered during inter partes review proceedings (“IPRs”).  Aqua Prods. v. Matal, 2017 U.S. App. LEXIS 19293.

The case concerns U.S. Patent No. 8,273,183, relating to a self-propelled cleaning apparatus for cleaning a submerged surface of a pool or tank, assigned to Aqua Products, Inc, (“Aqua”).  In the underlying IPR proceeding (IPR2013-00159), the Board denied Aqua’s motion to amend various claims of the ’183 patent.  The PTAB had followed its prior practice for deciding motions to amend, which placed a substantive burden of proving patentability on the patent owner.  MasterImage 3D, Inc. v. RealD Inc., No. IPR2015–00040, at *2–4 (P.T.A.B. July 15, 2015) (clarifying Idle Free Sys., Inc. v. Bergstrom, Inc., No. IPR2012–00027, at *4 (P.T.A.B. June 11, 2013)).  Aqua appealed the final written decision of the Board and a panel of the Federal Circuit concluded that the Board did not abuse its discretion in denying Aqua’s amendments.  Aqua requested en banc rehearing, which was granted and the court vacated the panel decision.

Upon en banc rehearing the case, the court interpreted 35 U.S.C. § 316(e) as placing the burden to prove all propositions of claim unpatentability on the petitioner, including amended claims.  To the extent they are inconsistent with its decision in Aqua Products, the court overruled its prior decisions in Microsoft Corp. v. Proxyconn, Inc., 789 F.3d 1292 (Fed. Cir. 2015); Prolitec, Inc. v. ScentAir Techs., Inc., 807 F.3d 1353 (Fed. Cir. 2015), petition for reh’g pending; Synopsys, Inc. v. Mentor Graphics Corp., 814 F.3d 1309 (Fed. Cir. 2016); and Nike, Inc. v. Adidas AG, 812 F.3d 1326 (Fed. Cir. 2016).  The court vacated the final written decision of the Board insofar as it denied the patent owner’s motion to amend the patent, and remanded it for the Board to issue a final decision under § 318(a) assessing the patentability of the proposed substitute claims without placing the burden of persuasion on the patent owner.

Entry of a Motion Into the IPR Distinguished From Entry of a Claim Into the Patent

The majority opinion distinguished the entry of a motion to amend into the IPR (motions to amend are the vehicle for proposing amended claims in IPR proceedings) from the substantive burden of proof that must be satisfied for entry of an amended claim into the patent:

“. . . any propositions of substantive unpatentability for amended claims are assessed following entry of the amended claims into the IPR proceeding, under the standards that apply to all claims in the proceeding.”

(Page 22, italics in original.)  The court summarized the amendment process:

“. . .  we believe that the only reasonable reading of the burden imposed on the movant in § 316(d) is that the patent owner must satisfy the Board that the statutory criteria in § 316(d)(1)(a)–(b) and § 316(d)(3) are met and that any reasonable procedural obligations imposed by the Director are satisfied before the amendment is entered into the IPR. Only once the proposed amended claims are entered into the IPR does the question of burdens of proof or persuasion on propositions of unpatentability come into play. It is at that point, accordingly, that § 316(e) governs, placing that burden onto the petitioner.”

(Page 24.)

Effects On The Settlement of IPRs

The majority opinion suggested how the the Board could consider a motion to amend in case there is settlement between the parties:

“If a settlement occurs and the IPR is terminated, no certificate incorporating the amendment into the patent ever issues. Section 318(b) makes clear that no certificate either reaffirming a challenged claim or substituting an amended claim for a challenged one issues unless and until the Board chooses to issue a final judgment under § 318(a) in which it assesses the patentability of both categories of claims. . . .

The final sentence of § 317(a) gives the Board the option to proceed to final judgment in any proceeding where the original petitioners choose not to continue their challenge. The Board might do this for any number of reasons. . . .

Should the Board elect to continue to a final written decision in this scenario, § 318(a) requires the Board to undertake a patentability analysis on all original and amended claims in the proceeding. Thus, it is at that point, and not earlier, that the statute contemplates consideration of an amended claim’s patentability. As the Supreme Court recognized in Cuozzo, where the challenger ceases to participate in the IPR and the Board proceeds to final judgment, it is the Board that must justify any finding of unpatentability by reference to the evidence of record in the IPR. . . .”

(Pages 34-35.)

The Board Must Base Its Patentability Determinations on the Entirety of the Record Before It

The court’s inquiry about whether the Board may sua sponte raise patentability challenges to the amended claims was “reserved for another day,” but the court did reiterate the panel decision that the Board may base its patentability determinations of amended claims on the entire record before it, and not limit itself solely on the face of the motion to amend.  (Pages 60-62.)  The court noted the Board’s decision to reject Aqua’s proposed amended claims without consideration of the entirety of the IPR record as an independent basis for vacating and remanding the matter to the Board.


Patent owners and petitioners routinely argued issues of patentability of proposed claim amendments prior to Aqua Products.  However, Aqua Products shifted the analysis from whether the patent owner proved patentability, to whether the petitioner demonstrated by a preponderance of the evidence that an amended claim is unpatentable.  Post Aqua Products, petitioners must assume that a motion to amend claims will get more of the Board’s attention, and the petitioner will bear more responsibility to make a full and convincing record of unpatentability of amended claims.  If it turns out that the Board grants more motions to amend post Aqua Products, petitioners will have to more carefully consider the availability of narrowing amendments that the patent owner could assert before recommending an IPR petition strategy.  Similarly, patent owners will have to decide if the guidance provided by Aqua Products will merit more frequent filing of motions to amend or if it is preferable to procure amended claims via reissue or continuation practice.


Posted in Adjudicative instead of examinatorial, Broadest Reasonable Interpretation standard, claim challenges, estoppel from administrative proceeding, Federal Circuit Review of PTAB Proceedings, Motion to Amend, preponderance of evidence, reexamination generally, Settlements in Post-Grant Proceedings, Termination of Post-Grant Proceedings | Tagged , , , , , , , , , , , , , , , , , , , , , , | Leave a comment

Shire’s Granted Motion to Amend Offers Additional Insight Into PTAB Amendment Practice

When a patent undergoes review at the Patent Trial and Appeal Board (“PTAB”), the Patent Owner has an opportunity to file a motion to amend claims so that a substitute claim can be proposed for each claim sought to be amended.  Stakeholders, and even some jurists, have been critical of the PTAB for denying the majority of motions to amend, but every once in a while one is granted by the PTAB.

In Amerigen Pharmaceuticals Limited. v. Shire LLC (IPR2015-2009), the PTAB granted Shire’s motion to cancel all the claims instituted for trial, with the exception of a single claim that was amended from being multiply dependent on claims that were instituted for trial and claims not instituted for trial to merely being dependent on claims not instituted for trial.

Amerigen filed a petition for inter partes review of claims 1-3, 5, 8, 9, 11, 18-21, 23 and 25 of RE42,096 in October, 2015.  Shire filed a preliminary response in January of 2016.  The PTAB instituted trial only on claims 18-21, 23, and 25, which is significant because claim 25 was multiply dependent on “any one of claims 2, 13 [not instituted for trial] or 18 to 20 [instituted for trial].”

In response to the institution decision, Shire filed a reconsideration request that asked for clarity on the status of claim 25 because it depended on claims that were in the trial and claims not in the trial.  Further in response to the institution decision, Shire filed a simple motion to amend that cancelled “instituted claims 18-21 and 23, plus claims 22 and 24 (each of which depends from claim  18).”  (Motion to Amend, 2.)  Shire also proposed substituting new claim 26 for 25 with the changes to the text of claim 25 shown as follows:

26. (Substitute for Claim 25) The pharmaceutical composition of any one of

claims 2[[,]] or 13 or 18 to 20 wherein the pharmaceutically active amphetamine

salt in (a) and (b) comprises mixed amphetamine salts.

Shire did not propose any new arguments or evidence concerning the patentability of claim 26, other than to state:

The proposed amendment cancels all instituted claims and proposes one substitute claim that cancels claim 25 as instituted, to the extent it depends from instituted claims. The amendments respond to the grounds asserted for unpatentability (37 C.F.R. § 1.121(a)(2)(i)) and they do not enlarge the scope of the claims or introduce new subject matter (37 C.F.R. § 1.121(a)(2)(i)).

Amerigen filed an opposition to Shire’s motion to amend, arguing in part:

  • Shire failed to satisfy the requisite showings of patentability over the prior art under Masterimage and Idle Free,
  • Shire did not set forth any prima facie case of patentability of claim 26 for Amerigen to rebut, and
  • Shire did not cite another IPR (IPR2016-01033) relating to claims 2 and 13 [however, these claims were ultimately not instituted for trial in that IPR either].

The PTAB denied Amerigen’s opposition motion and issued its Final Written Decision on March 31, 2017, granting Shire’s motion to amend instead.  The panel clarified that Idle Free places  a burden on the patent owner to show a patentable distinction over the prior art of record and also prior art known to the patent owner “in the instance where a feature is ‘added to each substitute claim, as compared to the challenged claim it replaces.’”   The decision differentiated the instant case:

In this instance, however, multiple dependent substitute claim 26 merely has the effect of eliminating three claims dependent on instituted claims 18–20, and preserving two claims dependent from non-instituted claims 2 and 13. As Patent Owner aptly explains, “[e]ffectively, no claim is being amended, and claims are only being cancelled, because claims 18–24 are being removed, and proposed claim 26 removes three multiple dependent claims (claim 25 as it depends from claims 18–20)” and “[n]o other changes to the claims are being made.” Paper 14, 2.

With the cancellation of claims 18–25, and the entry of substitute claim 26, there would be no claim remaining subject to inter partes review in this proceeding. We agree with Patent Owner that “[t]here is no requirement for Shire to prove, after the Institution Decision, that original non-amended claims are patentable over all potential prior art, especially non-instituted claims.” Paper 21, 4.

Thus, Shire was able to convert claim 25 that was multiply dependent on claims that were in the trial and claims not in the trial, to new claim 26 that is multiply dependent on claims not in the trial, without proof of patentability because no new feature was added to the amended claim.

Could the same result have been accomplished more simply, such as with a motion for adverse judgment?  To do that, Shire would have had to cancel claim 25 and lose the subject matter of what amounted to claim 26.  This is one complication associated with partial institution and multiple dependent claims.  The instant decision provides guidance about how to make amendments that will cancel subject matter in claims instituted for trial, and yet salvage claimed subject matter not involved in the institution of inter partes review.

Posted in claim challenges, inter partes review, Motion to Amend, prior art, PTAB, Uncategorized | Tagged , , , , , , , , , , , , | Leave a comment

ChanBond Avoids Institution of Six Cisco IPR Petitions

ChanBond sued several cable company defendants alleging patent infringement of three wideband signal distribution system patents in the District of Delaware in 2015.  The defendants included Atlantic Broadband Group, Bright House Networks, Cable One, Cablevision, Cequel Communications, Charter Communications, Comcast Communications, Cox Communications, Mediacom Communications, RCN Telecom Services, Time Warner Cable, WaveDivision Holdings, and Wideopen West Finance (District of Delaware case nos. 15-cv-842 to -854).  Non-party Cisco filed eight IPR petitions against the three ChanBond patents in September 2016, and a stay was ordered on March 3, 2017 pending the PTAB’s decisions to institute IPR.

Cisco’s IPR petitions had mixed results.  The day the stay was ordered the PTAB instituted inter partes review of claims 1,2, 5, 6, 19, 20, 23 and 29 from US Patent 7,941,822 (IPR2016-01744), but denied institution of claims 13 and 14 in a second IPR petition of the ‘822 patent (IPR2016-01746).  (Note:  RPX filed an IPR petition on claims 1-31 of the ‘822 which was instituted for trial and oral arguments were held in January 2017.  A final written decision has not been issued by the PTAB yet.  See IPR2016-00234.)

On March 29, 2017, six IPR petitions for US Patent Nos. 8,341,679 and 8,984,565 were denied institution.  The denial was based on a difference in opinion about the broadest reasonable interpretation for the term “RF channel,” which affected every claim Cisco sought to have reviewed.  (For brevity, only the documents relating to IPR2016-01898 will be referenced in the following discussion, since the other 5 IPR petitions were denied on substantially identical grounds in the remaining five proceedings:  IPR2016-01899, -01900, -01889, -01890, and -01891).

Cisco took the position that “RF channel” encompasses not only radio transmissions in different frequency bands, but also radio transmissions that can be in the same frequency band that use a code multiplex to encode the transmission into different “channels.”  Cisco proposed a construction for “RF channel” that “includes ‘an RF path for transmitting electric signals.'”  (Petition at 13, citing the ‘679 patent at 6:62-65.)  Cisco’s prior art was also directed to Code Division Multiple Access (CDMA) systems which rely on spread spectrum (“a wideband channel,” as stated in Ex. 1002, ¶ 58) as opposed to different transmission bands.

ChanBond filed Preliminary Responses that rejected such a broad interpretation of “RF channel,” asserting “the invention is directed to using multiple separate RF channels to transport a data stream — a specific type of frequency-division multiple access (FDMA).”  (Prelim. Resp. at pp. 6, 14-24.)  ChanBond asserted that Cisco’s CDMA prior art “is the polar opposite of [its specific FDMA] invention.”  (Prelim. Resp. at p. 7.)

The PTAB rejected Cisco’s assertion that multiple channels are multiplexed on the same frequency bands, and that code channels or CDMA channels could be an RF channel within the meaning of the ‘679 patent.  The panel cited an inconsistent statement by Cisco’s expert which described a FDMA and CDMA hybrid system using Walsh codes:  “[t]he mutual orthogonality of Walsh codes allows one particular coded channel to be isolated and decoded from all other coded channels, even though they are all broadcasting on the same RF channel.” (italics added by the panel).  The panel reasoned that this statement referred to a particular frequency band as an “RF channel” and to divisions within the RF channel as “coded channels,” and therefore gave no weight to the expert’s testimony regarding the meaning of “RF channel.”

The PTAB concluded that the term “RF channel” as used in the ‘679 patent “does not include code channels – for example data streams created by CDMA– but instead refers only to frequency bands, such as those created by FDMA.”  (Final Written Decision of IPR2016-01898, p. 13.)  All six of the IPR petitions of the ‘679 and ‘565 patents were denied based on the claim construction issue and because Cisco’s grounds were based CDMA prior art.

It appears that the one year window after service to file IPRs has passed, so it will be interesting to see if a request for rehearing is filed by Cisco to challenge the panel’s decision.  It is not clear if the interpretations proffered by the panel will somehow pose issues for ChanBond to enforce its patents as planned, but it has at least avoided further review of the ‘679 and ‘565 patents for now.

Posted in 315(b) One Year Bar, Broadest Reasonable Interpretation standard, Claim Construction, inter partes review, Litigation, PTAB, PTAB Patent Trials | Tagged , , , , , , , , , , , , , | Leave a comment

Best Practices and Strategies for Patent Procurement and Enforcement Webinar Series

Looking for a holistic view of best practices and strategies for patent procurement and enforcement?  You are invited to attend a free, two-part webinar on best patent practices. Click this link to register.  I will be co-presenting with Christopher Larus of Robins Kaplan to offer best practices for patent generation and patent enforcement. Each webinar is one hour long and we will apply for CLE credits for registered attendees. The webinars are set for February 22 and March 29.  Please join us!


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PTAB Narrows Its Preliminary Claim Interpretation To Uphold Cellular Patent

In July, 2014 Ericsson Inc. and Telefonaktiebolaget LM Ericsson (“Ericsson”) petitioned for inter partes review of claims 1, 2, 8-12 and 18-22 of U.S. Patent No. 7,787,431 owned by Intellectual Ventures II  LLC (“IV”).  In February, 2015, the Board instituted trial on claims 1 and 2 based on obviousness grounds, but denied institution of obviousness grounds for claims 8-12 and 18-22.  In a final written decision dated January 29, 2016, claims 1 and 2 of the ’431 patent were determined to be unpatentable.  (IPR2014-01195, Paper 37.)

Ericsson filed a second IPR petition in August, 2015, again challenging claims 8-12 and 18-22.  (IPR2015-01664, August 3, 2015.)  Claim 8 is representative:

8. A cellular base station comprising:

circuitry configured to transmit a broadcast channel in an orthogonal frequency division multiple access (OFDMA) coreband, wherein the core-band is substantially centered at an operating center frequency and the core-band includes a first plurality of subcarrier groups, wherein each subcarrier group includes a plurality of subcarriers, wherein the core-band is utilized to communicate a primary preamble sufficient to enable radio operations, the primary preamble being a direct sequence in the time domain with a frequency content confined within the core-band or being an OFDM symbol corresponding to a particular frequency pattern within the core-band,

wherein properties of the primary preamble comprise:

an autocorrelation having a large correlation peak with respect to sidelobes;

a cross-correlation with other primary preambles having a small cross-correlation coefficient with respect to power of other primary preambles; and

a small peak-to-average ratio; and

wherein a large number of primary preamble sequences exhibit the properties; and

circuitry configured to transmit control and data channels using a variable band including a second plurality of subcarrier groups, wherein the variable band includes at least the core-band.

In its Institution Decision, the Board provided a preliminary construction of “transmit[ting] a broadcast channel in an orthogonal frequency division multiple access (OFDMA) core-band.”  (Institution Decision, p. 11.)  The Board stated: “the plain meaning of transmitting a broadcast channel in a core-band merely requires transmitting some part of the broadcast channel in a core-band and does not exclude transmitting another part of the broadcast channel outside the core-band.” Id.

IV disagreed with the Board’s preliminary construction, asserting that an ordinarily skilled artisan would have understood the limitation to exclude transmitting any portion of the recited broadcast channel outside of the core-band. (Patent Owner Resp., pp. 35–36.)  According to the Board, Ericsson did not agree with or dispute IV’s assertion, and only asserted that IV’s proposed construction adds no clarity and that no construction is necessary.

In its Final Written Decision, the Board decided that its preliminary construction was unreasonably broad in view of IV’s arguments and its expert’s testimony:

Upon further review of the ’431 patent, particularly in view of Patent Owner’s arguments supported by Dr. Zeger’s testimony discussed above, we are persuaded that our preliminary partial construction was unreasonably broad to the extent that construction indicated the transmitting a broadcast channel limitation would be met by the transmission of a broadcast channel that is only partially within the core-band. Thus, we agree with Patent Owner that to show that the transmitting “a broadcast channel in an” OFDMA core-band limitation is met, Petitioner must demonstrate that the prior art teaches or suggests transmitting a broadcast channel, wherein the entire channel is contained within the core-band.

(Final Written Decision, pp. 8-9.)  The Board determined that Ericsson’s prior art combination failed to teach transmitting a broadcast channel in an OFDMA core-band, as recited in independent claims 8 and 18.  The Board found that a particular prior art reference (Yamaura) did transmit in the OFDMA core-band at times, but it did not have sufficient evidence that at other times it did not transmit outside of that band, and therefore it did not teach the recited OFDMA core-band limitation.

Even though the second IPR was instituted for trial on claims 8-12 and 18-22 based on a broad construction of the claims, the claims were not shown to be obvious based on a narrowed interpretation of the claims adopted in the Final Written Decision.

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