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Exploring the Latest in Intellectual Property Law
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Argument Forfeit in Remand Notwithstanding Modified Claim Construction

by | Aug 4, 2022 |

In the second appeal arising from an inter partes review (IPR), the US Court of Appeals for the Federal Circuit found that its revised claim construction from the first appeal did not permit the patent challenger to raise a new argument in a remand proceeding at the Patent Trial & Appeal Board (Board) since the patent owner’s response in the original proceeding had sufficiently put the challenger on notice of the claim construction that was adopted in the first appeal. Wireless Protocol Innovations, Inc. v. TCT Mobile, Inc., Case No. 21-2112 (Fed. Cir. July 19, 2022) (Prost, Taranto, Chen, JJ.)

Wireless Protocol Innovations (WPI) owns a patent related to controlling data flow in a point-to-multipoint communications system. WPI filed a district court complaint in 2015 asserting the patent against TCT. In response, TCT filed IPR petitions challenging certain claims of the patent. The petition presented three grounds of unpatentability, one of which relied on a reference by Sen. TCT’s petition did not propose constructions for any claim terms and argued that Sen taught the “grant pending absent state” limitation of the challenged patent. WPI argued that Sen failed to disclose “transitioning” between the “grant pending absent” and “grant pending” states after a “subsequent bandwidth grant,” as required by the claims. In its reply, TCT maintained that Sen taught the limitation but never argued that Sen could be readily modified to include a “grant pending absent state.” The Board found all of the challenged claims to be unpatentable on two grounds, one of which relied on Sen. WPI appealed.

The Federal Circuit reversed the Board’s decision with respect to the first ground, vacated the Board’s decision relying on Sen because the Board applied a flawed claim construction of “grant pending absent state,” and remanded the IPR for the Board to reconsider in view of the Court’s new claim construction. The Court also specifically declined to “prejudge what arguments TCT has properly preserved or should now be permitted to advance or what determinations as to Sen, Rydnell, and admitted prior art are supported by the evidence.”

On remand, the Board allowed the parties to submit additional briefing and expert testimony limited to the issue of whether Sen described operating a consumer premises equipment (CPE) in a “grant pending absent state” as interpreted by the Federal Circuit. TCT maintained its argument that Sen disclosed a grant pending absent state and argued for the first time that, in the alternative, it would have been obvious to a person skilled in the art to modify Sen to meet the limitation. The Board issued a remand decision finding the challenged claims unpatentable. Again, WPI appealed.

The Federal Circuit found that TCT had failed to preserve its new claim construction and obviousness argument and that “failure to timely assert a right or raise an argument constitutes forfeiture.” The Court explained that TCT acknowledged that it understood, prior to its reply, that WPI sought to distinguish the claimed “grant pending absent state” from Sen because Sen involved some [...]

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Claim Construction Error Fuels Remand

by | Aug 4, 2022 |

The US Court of Appeals for the Federal Circuit vacated and remanded a district court’s noninfringement decision, finding that the district court improperly construed the asserted claims as requiring a dual-fuel system. Ethanol Boosting Sys., LLC v. Ford Motor Co., Case No. 21-1949 (Fed. Cir. July 18, 2022) (Moore, Hughes, JJ.) (Newman, J., dissenting) (non-precedential).

Ethanol Boosting Systems (EBS) filed suit against Ford for infringement of three patents relating to fuel management systems for spark ignition engines that include both a direct injection and a port fuel injection fueling system. During claim construction, Ford argued that the direct injection fuel system required “a fuel that contains an anti-knock agent . . . that is different from the fuel used for port injection.” The district court agreed with Ford, relying on the patents’ titles, figures and background sections. The district court noted that no figures depicted a single fuel engine, and that the specification repeatedly referenced direct injection of a non-gasoline fuel, such as ethanol, into a gasoline engine. The district court acknowledged that the specification made a singular reference to a 100% ethanol embodiment but found that this disclosure did not teach a single fuel engine and that it was in the context of a dual-fuel engine. In view of this construction, the parties stipulated to judgment of noninfringement. EBS appealed.

Reviewing claim construction de novo, the Federal Circuit found that nothing in the asserted claim language required the use of different fuels in the direct-injection and port-injection systems. The Court also found that the specification imposed no such requirement, relying on one embodiment that disclosed “100% of the fuel . . . come[s] from ethanol with a smaller fraction being port injected.” The Court rejected Ford’s citation to multiple passages requiring the use of two fuels, finding that those statements could not describe the invention as a whole because they did not describe all embodiments (namely, the aforementioned 100% ethanol embodiment). Ford also cited to an earlier Federal Circuit decision in which family members of the asserted patents were construed to require dual fuels. The Court disagreed, concluding that those patents had different specifications that did not disclose the 100% ethanol embodiment. The Court finally turned to the prosecution history of a different patent family member that has the same specification as the asserted patents. In that application’s prosecution history, the patent holder distinguished a prior art reference on the ground that it only used a single fuel type. The Court declined to import such a limitation from a statement made in that prosecution history because it did not reflect the claim language. The Court concluded that the district court erred in construing the claims to require a dual-fuel system and remanded the case for further proceedings.

Judge Newman issued a stinging dissent, taking the panel majority to task for departing from what she regarded as settled claim construction law. She agreed with the district court that the 100% ethanol example, considered in context, was “merely discussing how this [...]

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Claim Construction and Jurisdictional Discovery Are More Than Skin Deep

by | Jun 23, 2022 |

Referencing the use of antecedents from a “wherein” clause, the US Court of Appeals for the Federal Circuit reversed a district court’s claim construction and vacated its summary judgment ruling of indefiniteness that relied on that construction. University of Massachusetts v. L’Oréal S.A., Case No. 21-1969 (Fed. Cir. June 13, 2022) (Prost, Mayer, Taranto, JJ.) The Court also reversed the dismissal of a defendant based on personal jurisdiction, finding error in the district court’s refusal to permit jurisdictional discovery before granting a motion to dismiss on that basis.

This case involved two patents directed towards the topical treatment of skin with a composition of adenosine at a certain concentration, held by the University of Massachusetts (UMass). L’Oréal is French-based company (L’Oréal S.A.) and its US-based company (L’Oréal USA) were involved in the suit. L’Oréal S.A. moved to dismiss for lack of personal jurisdiction, and the district court granted the motion without an opportunity for UMass to conduct jurisdictional discovery. After the dismissal, the district court ruled on the construction of a claim limitation and subsequently wielded that construction to invalidate another limitation as indefinite. The district court entered a final judgment of invalidity on this basis. UMass appealed, challenging the claim construction and lack of jurisdictional discovery.

Construction Using “Wherein” Clause

The Federal Circuit explained that there are two steps in reviewing claim construction: determining whether there is a plain meaning of a disputed term and, as necessary, properly construing the term. After determining that there was no plain meaning of the claim term “concentration,” the Court addressed the construction of the phrase “topically applying to the skin a composition comprising a concentration of adenosine.” The Court found that the district court erred in its determination that the “concentration applied to the dermal cells” meant that the concentration must be measured by the concentration directly applied to the dermal cells beneath the skin, rather than the composition applied to the surface of the skin. The Patent Trial & Appeal Board had adopted the same interpretation in an inter partes review, and therefore “concentration applied to the dermal cells” required no further construction.

UMass challenged that the proper construction. The Federal Circuit, citing to support in the specification, stated that the concentration of adenosine found in the composition should be construed as that applied to the epidermis. Viewing the claim as a whole and use of antecedents, the Court explained that “applied” could relate to both direct and indirect application. The Court specifically noted the use of the word “the” in the wherein clause, and found that this read, for antecedent, as the concentration of the composition. In viewing the prosecution history, the Court determined there was no disavowal of indirect application, and the specification and dependent claims supported a read of the term “concentration” to mean the composition applied to the surface of the skin, rather than requiring testing of the concentration to which the dermal cells were actually exposed. The Court also noted that in the prosecution history, UMass [...]

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Can’t Hide Behind Minor Clerical Error to Escape Willful Infringement Verdict

by | Jun 9, 2022 |

The US Court of Appeals for the Federal Circuit affirmed a district court decision correcting a clerical error in a claim. Pavo Solutions LLC v. Kingston Technology Company, Inc., Case Nos. 21-1834 (Fed. Cir. June 3, 2022) (Lourie, Prost, Chen, JJ.)

The Pavo patent is generally directed to a “flash memory apparatus having a single body type rotary cover.” CATR Co., later substituted by Pavo, sued Kingston for infringing the Pavo patent. Supported by the patent specification and prosecution, the district court judicially corrected the claim language in its claim construction order to read “pivoting the cover with respect to the flash memory main body,” not “pivoting the case with respect to the flash memory main body” (change emphasized). Pavo’s damages expert, Bergman, presented a profit-based model of reasonable royalty damages, relying on an earlier settlement agreement between CATR and IPMedia to arrive at a profit split of 18.75%, amounting to 40 cents/unit for Kingston. The jury returned a verdict of willful infringement and awarded Pavo a 20% reasonable royalty.

Judicial Correction

The Federal Circuit addressed and affirmed three issues on appeal, the first being that the district court approximately corrected an obvious minor clerical error in the claims. Correction is appropriate “only if (1) the correction is not subject to reasonable debate based on consideration of the claim language and the specification and (2) the prosecution history does not suggest a different interpretation of the claims.” In deciding whether a particular correction is appropriate, a court “must consider how a potential correction would impact the scope of a claim and if the inventor is entitled to the resulting claim scope based on the written description of the patent.”

The Federal Circuit decided that the error was clear from the full context of the claim language, supported by the specification, and did not broaden the claim scope. Additionally, the correction was not subject to reasonable debate. Judicial correction “is merely giving to it the meaning which was intended by the applicant and understood by the examiner.” Kingston’s alternative correction would just reverse the order in which the structural components appear in the claim.

The prosecution history also did not suggest a different interpretation of the claim. The applicant and the examiner consistently characterized the claims as describing pivoting the case within the cover, which both the Patent Trial & Appeal Board (Board) and the court recognized. Each reviewing body understood the nature and scope of the invention consistent with correcting “case” to “cover.” Kingston argued that the Board denied the applicant’s request to correct the language, but the denial was on procedural grounds.

Willfulness

Second, the Federal Circuit determined that Kingston could form requisite intent to support a willful infringement verdict despite its arguments that it reasonably relied on not infringing the claims as originally written, and it could not anticipate that a court would later correct the claims. However, “reliance on an obvious minor clerical error in the claim language is not a defense to willful infringement.” By definition, [...]

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“Self-Similar” More Objective Than One Might Think

by | Jun 9, 2022 |

The US Court of Appeals for the Federal Circuit affirmed a Patent Trial & Appeal Board (Board) decision holding that the term “self-similar” was not indefinite and denying leave to file a sanctions motion. ClearOne, Inc. v. Shure Acquisition Holdings, Case No. 2021-1517 (Fed. Cir. June 1, 2022) (Moore, Newman, Hughes, JJ.)

Shure owns a patent relating to arrays of microphones and housings that can be fitted to a drop ceiling grid, providing “equivalent beamwidth performance at any given look angle.” During inter partes review, Shure moved to amend the claims to add a new claim reciting microphones “arranged in a self-similar configuration.” The Board granted that motion, holding that “self-similar” was not indefinite. The Board denied ClearOne’s motion for rehearing and separate motion for sanctions alleging a failure to disclose prior that Shure had asserted in a post-grant review initiated against one of ClearOne’s patents.

The Federal Circuit first reviewed the Board’s indefiniteness holding. Since “[d]efiniteness is a matter of claim construction,” the Court applied de novo review while reviewing underlying factual determinations for substantial evidence. The Court held that the intrinsic record alone supported the Board’s definiteness finding because it provided the scope of “self-similar” with reasonable certainty. The specification disclosed microphones arranged in a “self-similar or repeating configuration”; a “fractal, or self-similar, configuration surrounding a central microphone”; and arrangements in circular or other repeating shapes, such as “ovals, squares, rectangles, triangles, pentagons, or other polygons.” Thus, “self-similar,” when read in view of the specification, informed skilled artisans about the scope of the invention with reasonable certainty.

The Federal Circuit rejected ClearOne’s argument that “self-similar or fractal-like” and “self-similar or repeating” distinguished self-similar from other types of patterns, holding that in context, it was clear that the phrases equated, not juxtaposed, self-similar with those patterns. Reviewing the extrinsic evidence, the Court also rejected ClearOne’s arguments premised upon “a series of rhetorical questions to show [ClearOne’s] varying interpretations of the self-similar term.” The possibility of varying interpretations, the Court held, “does not render [a term] indefinite,” as otherwise nearly every term would be indefinite if susceptible to alternative plausible constructions.

The Federal Circuit also rejected ClearOne’s motion for leave to seek sanctions. The Board held that allowing the sanctions motion would lead to an inefficient proceeding because the sanctions motion raised the same arguments as the denied request for rehearing, a ruling that ClearOne conceded on appeal. The Board also found a lack of intent to breach a duty to disclose references. Without analysis and applying the abuse of discretion review standard, the Court found that these factual determinations sufficiently established that the Board did not abuse its discretion.



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Except Where Futile, Litigant Must Preserve Issue at Jury Instruction Phase to Preserve Claim Construction Dispute

by | Jun 2, 2022 |

The US Court of Appeals for the Federal Circuit affirmed the denial of a defendant’s post-judgment motion for a new trial based on a failure to preserve an O2 Micro challenge. The Court also reversed the denial of a prejudgment interest award to the plaintiff. Kaufman v. Microsoft, Case Nos. 21-1634; -1691 (Fed. Cir. May 20, 2022) (Dyk, Reyna, Taranto, JJ.)

Michael Philip Kaufman brought a patent infringement suit against Microsoft asserting his now-expired patent that covered a method for operating a computer to automatically generate an end-user interface that permit users to interact with data in relational databases (which store data in multiple tables that are related to each other in defined ways). Kaufman alleged infringement by Microsoft’s development tools for the .NET framework software platform, specifically Microsoft’s Dynamic Data product that allegedly automatically generated a web application for viewing and editing data. A jury found Microsoft liable for infringement and awarded $7 million in damages. Post-trial, Microsoft moved for judgment as a matter of law and a new trial, arguing that the district court failed to resolve claim construction disputes before trial and that Microsoft was therefore entitled to a new trial under 02 Micro. Kaufman moved for prejudgment interest. Both motions were denied, and both sides appealed.

Microsoft argued that the district court erred by not clarifying the claim term “automatically” and that a new trial was warranted under O2 Micro because the clarification reasonably could have led the jury to a different verdict. The Federal Circuit disagreed, explaining that Microsoft failed to preserve its O2 Micro challenge by not pursuing the matter at the jury instruction phase. The Court reasoned that the parties did not request a construction of “automatically” during the original Markman proceeding, nor did Microsoft propose a definition of “automatically” in its proposed jury instructions defining the term. Further, in its summary judgment briefing, Microsoft only said that there was a “fundamental legal dispute” as to the definition of “automatic.” Microsoft never clearly stated that a construction was needed on the term or offered the district court a formulation of such a claim construction. Microsoft also never defined a proposed construction for the term that would accommodate its action after trial. While the Court allowed that a claim construction issue does not always need to be re-raised in the specific setting of making proposals for, or airing objections to, jury instructions, that exception is limited to situations where the issue was sufficiently raised and settled earlier. The Court explained that application of that principle was settled in O2 Micro, “referring to circumstances in which the claim-construction position of the appellant was ‘made clear to the district court,’ a further objection would have been ‘not only futile but unnecessary,’ and the issue was ‘fully litigated and decided at the Markman stage of the litigation.’”

Turing to Kauffman’s appeal, the Federal Circuit reversed the denial of prejudgment interest. The district court had reasoned that the jury verdict “subsumed interest” and that Microsoft was prejudiced by [...]

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Use of Negative Claim Construction is Unsound

by | May 19, 2022 |

The US Court of Appeals for the Federal Circuit vacated a district court’s noninfringement decision that was based on a negative claim construction and remanded with instructions for the district court to determine what affirmative claim construction should be adopted. Sound View Innovations, LLC v. Hulu, LLC, Case No. 21-1998 (Fed. Cir. May 11, 2022) (Prost, Mayer, Taranto, JJ.)

Sound View owns a now-expired patent directed to streaming multimedia information over public networks. Sound View asserted the patent against Hulu based on Hulu’s use of a central content server that’s connected to end users through intermediate edge servers. The asserted claim recites downloading streaming content from a buffer in a helper server to an end user while concurrently retrieving more streaming content from a content server. During claim construction, the district court construed the downloading/retrieving limitation to require using the same buffer, as opposed to two different buffers.

With that claim construction in hand, Hulu sought summary judgment that, in the edge servers of its content delivery networks, no single buffer hosts both the video portion downloaded to the client and the retrieved additional portion. In response, Sound View argued that a factual dispute remained about whether “caches” in the edge servers met the concurrency limitation as construed. The district court held, however, that a “cache” cannot be a “buffer,” and on that basis granted summary judgment of noninfringement. The district court also excluded Sound View’s expert testimony on reasonable royalty damages. Sound View appealed.

The Federal Circuit first reviewed construction of the downloading/retrieving limitation, which was reviewed de novo since the district court relied on only the intrinsic evidence. The Court first analyzed the claim, noting that its wording “reasonably suggests allocating a single buffer” and did not suggest additional buffers. When reviewing the specification, the Court found that it was not inconsistent with reading the claims requiring that the same buffer be used for both downloading and retrieving and observed that it disclosed an embodiment with only one buffer. The Court also reviewed the prosecution history, noting that the applicants added the limitation at issue to distinguish prior art and specifically emphasized the “concurrent[]” limitation. Thus, the Court affirmed the district court’s construction of the downloading/receiving limitation.

Turning to the noninfringement finding, the Federal Circuit rejected the district court’s finding that a “cache” was a different, distinct physical component when compared to a “buffer.” In particular, the Court took issue with this interpretation because it was a negative construction, and the district court never provided an affirmative construction to be used in the infringement analysis. The Court also found that the intrinsic evidence did not support determining that “buffers” and “caches” were mutually exclusive. The Court thus reversed and remanded for the district court to determine an affirmative construction of “buffer.”

The Federal Circuit next addressed the district court’s decision to exclude evidence from Sound View’s expert on reasonable royalty damages. First, the Court determined that the expert could not rely on a study performed in Sydney, Australia [...]

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Missed Connection: Avoid Claim Construction Rendering Independent Claim Narrower Than Dependent Claim

by | Apr 14, 2022 |

The US Court of Appeals for the Federal Circuit vacated a district court’s claim constructions concerning generic independent claims that were amended after a species restriction requirement, because the district court disregarded the doctrine of claim differentiation after incorrectly concluding that the examiner had mistakenly rejoined withdrawn claims. Littelfuse, Inc. v. Mersen USA EP Corp., Case No. 21-2013 (Fed. Cir. Apr. 4, 2022) (Prost, Bryson, Stoll, JJ.)

Littelfuse owns a patent directed to a fuse end cap for providing an electrical connection between a fuse and an electrical conductor. The specification teaches three embodiments of the invention:

  1. A single-piece machined end cap comprising a mounting cuff and a terminal
  2. A single-piece stamped end cap comprising a mounting cuff and a terminal
  3. A two-piece assembled end cap comprising a mounting cuff, a terminal and a fastening stem attaching the mounting cuff to the terminal.

The originally filed claims included independent claims covering an end cap with a mounting cuff and a terminal, and dependent claims directed to the three embodiments. The claims directed to the two-piece assembled end cap embodiment contained the limitation that the terminal is press-fit onto the fastening stem.

During prosecution, the examiner issued a restriction requirement, asserting that the independent claims were generic to the three species in the dependent claims. Littelfuse elected to prosecute the assembled end cap species and the examiner withdrew the claims directed to the other embodiments. In response to a novelty rejection, Littelfuse amended the independent claims by adding the fastening stem element without specifying that the terminal is press-fit onto the stem. After allowing the amended independent claims, the examiner concluded that the previously withdrawn claims “require all the limitations of the . . . allowable claims,” and thus rejoined them.

Littelfuse sued Mersen for selling allegedly infringing fuses. The parties asked the district court to determine whether the fastening stem element in the independent claims limited Littelfuse’s patent to multi-piece end caps, despite the rejoined dependent claims being directed to one-piece embodiments. The district court found that the claim language, the specification and the prosecution history required the invention to have a multi-piece construction. First, the district court determined that the plain meaning of “fastening stem” was “a stem that attached or joins the other two components of the apparatus.” The district court then noted that the fastening stem was only mentioned in the specification in relation to the multi-piece embodiment in which the terminal is joined to the mounting cuff by the fastening stem. While Littelfuse argued that the US Patent & Trademark Office’s rejoining of the withdrawn claims meant that the independent claims covered unitary and multi-piece embodiments, the district court reasoned that the claims were rejoined based on a “misunderstanding” because they referred to the original independent claim, which did not include a fastening stem. In light of the district court’s finding that the independent claims covered only a multi-piece apparatus, the parties stipulated to non-infringement. Littelfuse appealed.

Applying the doctrine of claim differentiation, the [...]

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Game Reset: Extrinsic Evidence Can’t Limit Claim Scope Beyond Scope Based on Unambiguous Intrinsic Evidence

by | Apr 7, 2022 |

The US Court of Appeals for the Federal Circuit reversed a district court’s grant of summary judgment of noninfringement after concluding that the district court erred by relying on expert testimony to construe a claim term in a manner not contemplated by the intrinsic evidence. Genuine Enabling Tech. LLC v. Nintendo Co., Ltd., et al., Case No. 20-2167 (Fed. Cir. Apr. 1, 2022) (Newman, Reyna, Stoll, JJ.)

Genuine owns a patent directed to a user interface device (UID) that, in the process of synchronizing and merging data streams into a combined data stream, directly receives microphone speech input and transmits speech output via a speaker. During prosecution, the inventor distinguished “slow varying” physiological response signals discussed in a prior art reference from the “signals containing audio or higher frequencies” in his invention, arguing that the latter posed a signal “collision” problem that his invention solved. In distinguishing the prior art, the inventor explained that his invention “describes, in its representative embodiments, how to combine the data from a UID (mouse) and from a high-frequency signal, via a framer, which is unique and novel.”

Genuine subsequently filed a lawsuit against Nintendo, accusing Nintendo’s Wii Remote, Wii Remote Plus, Nunchuk, WiiU GamePad, Switch Joy-Con Controller and Switch Pro Controller of infringing the patent. During claim construction, the parties asked the district court to construe the term “input signal.” Genuine proposed the construction of the disputed claim term to be “a signal having an audio or higher frequency,” whereas Nintendo proposed the narrower construction of “[a] signal containing audio or higher frequencies.” Relying on expert testimony, Nintendo also argued that the inventor “disclaimed signals that are 500 [Hz] or less . . . generated from positional change information, user selection information, physiological response information, and other slow-varying information.”

The district court found that the inventor’s arguments amounted to a disclaimer. Crediting Nintendo’s expert testimony, the district court construed “input signal” as “signals above 500 Hz and excluding signals generated from positional change information, user selection information, physiological response information, and other slow-varying information.” The district court subsequently granted summary judgment of noninfringement, finding that the accused controllers produced the types of slow-varying signals that the inventor had disclaimed during prosecution. Genuine appealed.

Genuine argued that the district court erred in construing “input signal” by improperly relying on extrinsic evidence and improperly finding that the inventor disclaimed certain claim scope during prosecution. The Federal Circuit agreed, reiterating that although extrinsic evidence can be helpful in claim construction, “the intrinsic record ‘must be considered and where clear must be followed,’” such that “where the patent documents are unambiguous, expert testimony regarding the meaning of a claim is entitled to no weight.” In this case, although the parties agreed that the inventor had disavowed claim scope during prosecution, there was a dispute as to the scope of the disclaimer beyond signals below the audio frequency spectrum.

The Federal Circuit explained that for a statement made during prosecution to qualify as a disavowal of claim scope, it [...]

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Not a Bullseye: Defendant Must Rebut Presumption That Claims Lacking “Means” Language Don’t Fall Under § 112 ¶ 6

by | Mar 31, 2022 |

Reversing a district court finding of indefiniteness under 35 U.S.C. § 112 ¶ 6, the US Court of Appeals for the Federal Circuit found that the district court erred by ignoring unrebutted evidence that the challenged claim terms would have been understood to connote sufficiently definite structure to avoid means-plus-function construction. Dyfan, LLC v. Target Corp., Case No. 21-1725 (Fed. Cir. Mar. 24, 2022) (Lourie, Dyk, Stoll, JJ.)

Dyfan sued Target for infringement of two patents directed to location-based message delivery. During claim construction proceedings, Target argued that certain claim limitations should be construed as means-plus-function limitations and that the specification failed to disclose the requisite corresponding structure. The district court found that three claim terms were subject to § 112 ¶ 6. For the terms “code” and “application,” the court assigned a “special-purpose computer function” as the corresponding structure and found that the specification did not disclose a requisite algorithm for the functions of the computer. The district court also found that the claim term “system” was subject to § 112 ¶ 6 because it recited purely functional language without disclosing sufficient corresponding structure, and that it was unclear which of the recited components performed the recited function. The district court concluded that all three terms were indefinite under § 112 ¶ 2 for lack of corresponding structure. Dyfan appealed.

Reviewing de novo, the Federal Circuit first addressed whether the claim language invoked § 112 ¶ 6. As the Court had stated previously, there is a rebuttable presumption that a claim limitation is not drafted in a means-plus-function format if it does not contain the term “means.” However, that presumption can be overcome if a challenger demonstrates that the term fails to recite sufficiently definite structure. The Court also explained that for purposes of § 112 ¶ 6, certain “nonce words that reflect nothing more than verbal constructs” are tantamount to using the word “means.”

Turning to the case merits, the Federal Circuit first considered the terms “code” and “application.” Given the absence of “means” language, Target was required to show by a preponderance of the evidence that persons of ordinary skill in the art would not have understood those terms to connote structure considering the claim as a whole. The Court found that the district court erred in concluding that Target overcame the presumption that § 112 ¶ 6 did not apply. The Court relied on unrebutted testimony from Target’s expert witness that the district court ignored. The expert testified that both terms would have connoted structure, such as off-the-shelf software. The Court found that this unrebutted testimony demonstrated that neither claim limitation recited purely functional language.

The Federal Circuit explained that the district court failed to follow its 2018 decision in Zeroclick v. Apple. In that case, the Court reversed a district court’s finding that the claim terms “program” and “user interface” invoked § 112 ¶ 6, finding that both terms were references to conventional program code existing in the prior [...]

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