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A Maze-Like Path and Laundry List Don’t Provide Written Description

by Cecilia Choy, PhD | Mar 16, 2023 | Patents

The US Court of Appeals for the Federal Circuit affirmed a Patent Trial & Appeal Board (Board) decision that there was insufficient written description in the asserted priority applications to support a genus claim because of a lack of ipsis verbis disclosure and insufficient blaze marks. The Court concluded that the priority applications did not support an early priority date. Regents of the University of Minnesota v. Gilead Sciences, Inc., Case No. 21-2168 (Fed. Cir. March 6, 2023) (Lourie, Dyk, Stoll, JJ.)

Gilead filed a petition for inter partes review (IPR) challenging Minnesota’s patent directed to phosphoramidate prodrugs preventing virus reproduction or cancerous tumor growth. Gilead’s US Food & Drug Administration-approved drug, sofosbuvir, is marketed by Gilead to treat chronic hepatitis C infections and falls within claim 1 of the patent.

The 2014 application that issued as the challenged patent claimed priority to four applications. In the IPR, Gilead argued that the claims were anticipated by a Gilead-owned patent publication (Sofia). The publications used in the decision are as follows:

NP3 and NP2 have the same disclosure. NP2 and P1 contain similar disclosures, which the Board called NP2-P1. The broader claim in NP2-P1 has a relationship of genus to the narrower subgenus claims in the patent at issue. There was no dispute that Sofia disclosed every limitation of each challenged claim. The Board held that NP2-P1 failed to provide a sufficient written description to support the asserted priority date of the challenged claims, which were therefore found to be anticipated by Sofia. Minnesota appealed.

Minnesota argued the following to the Federal Circuit:

The Board erred in holding that the NP2-P1 applications have insufficient written description.
The Board ran afoul of Administrative Procedure Act (APA) requirements.
Minnesota is a sovereign state entity immune from IPR.

35 U.S.C. § 120 sets forth requirements for a patent application to benefit from a filing date of an earlier application. Minnesota asserted that the NP2-P1 priority applications literally described or provided blaze marks to the challenged subgenus claims. The Federal Circuit disagreed, explaining that written description for a genus claim of chemical compounds raises “particular issues,” requiring a description of the outer limits of the genus and either a representative number of members or structural features common to the members of the genus. The Court found that the asserted priority applications (NP2-P1) did not provide such description and the challenged claims were not entitled to the filing dates of those applications.

The Federal Circuit found that the asserted priority applications did not provide ipsis verbis disclosure of the challenged subgenus claim. The Court quoted an oft-noted saying associated with Yogi Berra, a catcher for the New York Yankees some 50 years ago, about a notable failure to provide direction: “when one comes to a fork in the road, take it.” The Court also cited its 1996 decision in [...]

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Charter Schools Aren’t Immune from Trademark Suits

by Amol Parikh | Mar 16, 2023 | Trademarks

The US Court of Appeals for the Fifth Circuit affirmed a district court’s dismissal of a trademark suit against a charter school operator and public school district in Texas but explained that the charter school was not automatically immune from lawsuits based on sovereign immunity. Springboards to Education, Inc. v. McAllen Indep. School District, Case Nos. 21-40333; -40334 (5th Cir. Mar. 8, 2023) (Smith, Duncan, JJ.) (Oldham, J., concurring).

Springboards sells products to school districts in connection with its Read a Million Words Campaign. The campaign incentivizes school children to read books through promises of induction into the Millionaires’ Reading Club and access to rewards such as t-shirts, backpacks and fake money. Springboards’s goods typically bear any combination of trademarks that the company registered with the US Patent & Trademark Office, including “Read a Million Words,” “Million Dollar Reader,” “Millionaire Reader” and “Millionaires’ Reading Club.”

Springboards filed a complaint for trademark infringement, trademark counterfeiting and false designation of origin against McAllen Independent School District (MISD), a public school district in Texas, and IDEA Public Schools, a nonprofit organization operating charter schools in Texas. Both MISD an IDEA moved to dismiss for lack of subject matter jurisdiction, arguing that they were arms of the state and thus entitled to sovereign immunity. They also moved for summary judgment for lack of infringement. The district court ruled that only IDEA enjoyed sovereign immunity and accordingly granted IDEA’s motion to dismiss but denied MISD’s. The district court granted MISD’s motion for summary judgment after concluding that Springboards could not establish that MISD’s program was likely to cause confusion with Springboards’s trademarks. Springboards appealed.

The Fifth Circuit began with the jurisdictional issue of whether IDEA and MISD enjoyed sovereign immunity. The Court explained that determining whether an entity is an arm of the state is governed by the Clark factors, which were set forth in the Fifth Circuit’s 1986 decision in Clark v. Tarrant County. Those factors are as follows:

Whether state statutes and case law view the entity as an arm of the state
The source of the entity’s funding
The entity’s degree of local autonomy
Whether the entity is concerned primarily with local, as opposed to statewide, problems
Whether the entity has the authority to sue and be sued in its own name
Whether the entity has the right to hold and use property.

The Fifth Circuit analyzed each of the factors and concluded that IDEA was not an arm of the state. The Court found that factors 1 and 3 favored sovereign immunity while factors 2, 4, 5 and 6 did not. The Court’s decision focused heavily on factor 2, explaining that the inquiry under factor 2 has two parts: the state’s liability in the event there is a judgment against the defendant, and the state’s liability for the defendant’s general debts and obligations. The district court had concluded that factor 2 weighed in favor of immunity because 94% of IDEA’s funding came from the state and federal sources. The [...]

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Stryking Noncompete Preliminary Injunction

by Tessa Kroll | Mar 9, 2023 | Trade Secrets

The US Court of Appeals for the Sixth Circuit upheld a district court’s grant of a preliminary injunction restricting a former employee from working for conflicting organizations or communicating with a competitor’s counsel. Stryker Emp. Co., LLC v. Abbas, Case No. 22-1563 (6th Cir. Feb. 16, 2023) (Clay, Bush, JJ.; Sutton, C.J.) The Court found that the preliminary injunction was an appropriate measure to protect the plaintiff’s confidential information that was consistent with the employee’s noncompete agreement.

Stryker develops and manufactures spinal implants and related medical products. From 2013 through mid-2022, Stryker employed Abbas in various roles relating to finance and sales. As part of his job duties, Abbas led sales and finance projects, assisted with Stryker’s litigation efforts, and cultivated relationships with customers, distributors and sales representatives. These responsibilities required Abbas to have access to Stryker’s confidential information and trade secrets.

In April 2022, Abbas entered into a confidentiality, noncompetition and nonsolicitation agreement with Stryker. This agreement prohibited Abbas from disclosing Stryker’s confidential information without its consent and barred Abbas from working for “any Conflicting Organization” in which Abbas could use Stryker’s confidential information to boost the marketability of a “Conflicting Product or Service.” The noncompete provision was time limited to one year following Abbas’s departure from Stryker.

In summer 2021, a competing spinal implant manufacturer, Alphatec, began recruiting Abbas for a finance position. After determining that the finance position was too similar to Abbas’s previous work at Stryker, Alphatec created a new “sales role” that was allegedly “crafted to protect Stryker’s confidential information.” Abbas resigned from Stryker in May 2022 to take the newly created role.

Shortly after Abbas resigned, Stryker sued for breach of contract, misappropriation of trade secrets and violation of the Michigan Uniform Trade Secrets Act. Stryker also requested a no-notice temporary restraining order (TRO) and preliminary and permanent injunctions. The district court granted Stryker’s motion for preliminary injunction prohibiting Abbas from the following:

Working in any capacity for Alphatec or any “Conflicting Organization”
Having any ex parte communications with Alphatec’s counsel or otherwise disclosing information concerning Stryker’s litigation strategies.

Abbas appealed, arguing that the noncompetition portion of the preliminary injunction amounted to an industry-wide ban and that the communication portion impermissibly disqualified counsel.

The Noncompetition Provision

The Sixth Circuit first noted that federal law, rather than state law, defines a court’s power to issue a noncompetition restriction in a preliminary injunction. Under federal law, courts have discretion to craft preliminary injunctions based on the equities of a case and can even “proscribe activities that, standing alone, would have been unassailable.” Applying this standard, the Sixth Circuit reasoned that the preliminary injunction was not overly broad but instead preserved the status quo. First, the district court found that Abbas often worked beyond the scope of his position. Second, the district court agreed to entertain a motion to vacate the injunction if Alphatec created a new position for Abbas that Stryker found acceptable. Third, the injunction merely sought to enforce the noncompetition agreement, which [...]

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Out of Tune: Eleventh Circuit Permits Retrospective Relief for Timely Copyright Claims under Discovery Rule

by Kavya Rallabhandi | Mar 9, 2023 | Copyrights

The US Court of Appeals for the Eleventh Circuit furthered a circuit split in holding that, as a matter of first impression, a copyright plaintiff’s timely claim under the discovery rule is subject to retrospective relief for infringement occurring more than three years before the suit was filed. Nealy v. Warner Chappell Music, Inc., Case No. 21-13232 (11th Cir. Feb. 27, 2023) (Wilson, Jordan, Brasher, JJ.)

Section 507(b) of the Copyright Act includes a three-year statute of limitations that runs from the time the claim accrues, and a claim may only accrue one time under the discovery rule. In 2014, the US Supreme Court held in Petrella v. Metro-Goldwyn-Mayer, Inc., that the equitable doctrine of laches does not bar copyright claims that are otherwise timely under the three-year limitations period set forth in § 507(b). The circuits are split on Petrella’s application—the Second Circuit strictly limits damages from copyright infringement to the three-year period before a complaint is filed, whereas the Ninth Circuit permits retrospective relief for infringement occurring more than three years before the lawsuit’s filing as long as the plaintiff’s claim is timely under the discovery rule.

Music Specialist and Sherman Nealy (collectively, Music Specialist) filed a copyright infringement suit against Warner alleging that Warner was using Music Specialist’s musical works based on invalid third-party licenses and in violation of 17 U.S.C. § 501. The alleged copyright infringement occurred as early as 10 years before Music Specialist filed the present lawsuit. The district court denied Warner’s motion for summary judgment on statute of limitation grounds, finding that there was a genuine dispute of material fact regarding when Music Specialist’s claim accrual occurred. In a separate order, the district court certified for interlocutory appeal whether “damages in this copyright action are limited to the three-year lookback period as calculated from the date of the filing of the Complaint pursuant to the Copyright Act and Petrella.” Music Specialist appealed.

The Eleventh Circuit concluded that where a copyright plaintiff has a timely claim for infringement occurring more than three years before the filing of the lawsuit, the plaintiff may obtain retrospective relief for that infringement. The Court found that Petrella focused on the application of 17 U.S.C. § 507(b) to claim accrual under the injury rule, not the discovery rule, and was therefore inapplicable. The injury rule precludes recovery for harms occurring earlier than three years before the plaintiff files suit. On the other hand, the discovery rule permits damages recovery for infringing acts that copyright owners reasonably become aware of years later. Therefore, the discovery rule permits timely claims for infringement that occurred more than three years before the suit. The Eleventh Circuit found that the Supreme Court expressly reserved application of the discovery rule’s propriety for a future case and that, in the Eleventh Circuit’s opinion, the plain text of the Copyright Act does not place a time limit on remedies for an otherwise timely claim.

Practice Note: The Eleventh Circuit disagreed with the Second Circuit’s [...]

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Patent Law Principles Apply to Claim Scope: Orange Book Delisting and Listing and Regulations

by Benjamin Ediger, Ph.D. | Mar 9, 2023 | Patents

The US Court of Appeals for the Federal Circuit ordered that the only Orange Book patent asserted in a lawsuit must be delisted since its claims were directed to the computer-implemented distribution system and not a method of use. Jazz Pharms., Inc. v. Avadel CNS Pharms., LLC, Case No. 23-1186 (Fed. Cir. Feb. 24, 2023) (Lourie, Reyna, Taranto, JJ.)

Jazz Pharmaceuticals holds a new drug application (NDA) for Xyrem, an oral sodium oxybate solution prescribed to help those with certain narcolepsies manage cataplexy. Sodium oxybate itself is no longer covered by patents because it has been used in relation to narcolepsy since the 1960s. For this reason, Jazz built its patent portfolio around Xyrem’s formulation, use and distribution.

Jazz uses a single-pharmacy distribution system for Xyrem, known as a risk evaluation mitigation strategy (REMS). Implementing REMS was a condition of Xyrem’s US Food & Drug Administration (FDA) approval because it mitigates safety risks of dangerous active pharmaceutical ingredients such as sodium oxybate. One of Jazz’s patents is directed to this REMS distribution system. Abbreviated New Drug Application (ANDA) 505(b)(2) NDA (Hybrid NDA) approval is similarly conditioned on implementing a REMS that is sufficiently comparable to any that the NDA holder must implement. The FDA eventually determined that single-pharmacy systems were unnecessary for Xyrem and potentially detrimental.

Avadel submitted a hybrid NDA for a drug that requires only a single nightly dose, unlike Xyrem, which requires a patient to wake up during the night to ingest a second dose. Avadel’s application also proposed a more lenient REMS that utilizes multiple pharmacies. In view of these differences, Avadel believed that it could avoid a lengthy FDA approval process because all of Jazz’s Xyrem Orange-Book-listed patents seemed addressable without making any Paragraph IV certifications. As for the REMS patent, Avadel filed a statement under 21 U.S.C. § 355(b)(2)(B) because the patent was listed as claiming a method of use and Avadel was not seeking approval for the REMS system to which that patent’s claims were directed.

Jazz sued Avadel asserting seven patents, of which the REMS patent was the only Orange-Book-listed patent. Avadel asserted a counterclaim requesting that the district court order Jazz to delist the REMS patent from the Orange Book. The district court subsequently held a Markman hearing finding that the REMS patent’s claims were directed to a system and not a method. The district court granted Avadel’s motion for judgment on the pleadings, finding that the REMS patent did not claim “the drug for which the application was approved” and thus had to be delisted from the Orange Book. Jazz appealed.

Jazz argued that because the FDA permitted the REMS patent to be Orange Book listed, Avadel was prohibited from availing itself of the statutory delisting provision. The Federal Circuit disagreed, concluding that the language of the delisting provision was only concerned with whether a listed patent met the provisions’ conditions at the time of the triggering litigation.

Jazz also argued that there was no evidence that Congress imported patent-law [...]

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Free Speech Shines Bright, Illuminates Patent Owner’s Right to Allege Infringement

by Anisa Noorassa | Mar 2, 2023 | Patents

The US Court of Appeals for the Federal Circuit reversed a district court’s preliminary injunction prohibiting a patent owner from communicating its view that a competitor infringed, finding that the speech restriction was improper because the infringement assertions were not objectively baseless. Lite-Netics, LLC v. Nu Tsai Capital LLC, Case No. 23-1146 (Fed. Cir. Feb. 17, 2023) (Lourie, Taranto, Stark, JJ.)

Lite-Netics and Nu Tsai Capital d/b/a Holiday Bright Lights (HBL) compete in the market for holiday string lights. Both companies use similar magnetic mechanisms that allow users to secure the end of the lights. Lite-Netics owns several patents that describe and claim magnetically secured decorative lights. In June 2017, Lite-Netics sent a cease-and-desist letter to HBL demanding that it stop selling lights alleged to infringe Lite-Netics’s patents. After remaining silent for five years, Lite-Netics sent another cease-and-desist letter in April 2022 demanding that HBL either explain why its products did not infringe the Lite-Netics patents or stop selling the products.

When HBL refused to stop selling the allegedly infringing products, Lite-Netics sent communications to HBL’s customers notifying them of their infringement claim and threatening “all legal rights and remedies” to stop the sale of HBL’s products. Lite-Netics then filed a lawsuit against HBL for infringement of the patents. HBL asserted counterclaims, including tortious interference with business relationships, defamation under Nebraska law and bad faith patent-infringement communications. HBL also sought a preliminary injunction to prevent Lite-Netics from publishing further accusatory statements. Finding that HBL would likely succeed on its tortious interference and defamation claims and that Lite-Netics’ infringement allegations were “objectively baseless,” the district court granted the preliminary injunction. Lite-Netics appealed.

The Federal Circuit reversed the district court, finding that in cases where an injunction restricts a party’s rights to First Amendment protected speech about its federal patent rights, federal law preempts state tort law. The Court explained that federal law requires a higher “bad faith” standard of proof for a preliminary injunction that would impinge on those federal rights. The Court found that HBL had failed to show that Lite-Netics’s allegations and the publication of its allegations were made in bad faith or that those allegations were objectively baseless. The Court therefore reversed and remanded to the district court for further proceedings.

The Alice Eligibility Two-Step Dance Continues

by Kavya Rallabhandi | Mar 2, 2023 | Patents

The US Court of Appeals for the Federal Circuit affirmed a district court’s dismissal of a Fed. R. Civ. P. 12(b)(6) motion, holding that patent claims directed to abstract ideas and lacking inventive steps that transform abstract ideas into patent-eligible inventions fail the Alice two-step test and are not patent eligible under 35 U.S.C. § 101. Hawk Tech. Sys., LLC v. Castle Retail, LLC, Case No. 22-1222 (Fed. Cir. Feb. 17, 2023) (Reyna, Hughes, Cunningham, JJ.)

35 U.S.C. § 101 states that laws of nature, natural phenomena and abstract ideas are not patentable. The Supreme Court of the United States in Alice v. CLS Bank Int’l (2014) articulated a two-step test for examining patent eligibility: a patent claim falls outside § 101 if it is directed to a patent-ineligible concept such as an abstract idea and lacks elements sufficient to transform the claim into a patent-eligible application.

Hawk Technology sued Castle Retail alleging infringement of its patent directed to security surveillance video operations in Castle Retail’s grocery stores. The patent relates to a method of viewing multiple simultaneously displayed and stored video images on a remote viewing device of a video surveillance system using result-based functional language. Castle Retail moved to dismiss on the basis that the claims were not patent eligible under § 101. After conducting a technology briefing, the district court granted the motion. The district court ruled that the claims were abstract because surveillance monitoring is a common business practice and the claims recited little more than taking video surveillance and digitizing it for display and storage in a conventional computer system, and the claims did not limit the abstract idea to a new technological improvement in video storage/display that could transform the abstract idea into a patent-eligible invention. Hawk Technology appealed.

The Federal Circuit, reviewing de novo, affirmed. Addressing Alice step one, the Court found that the patent’s required functional results of receiving/digitizing video images, converting images to selected format and storing/displaying/transmitting the images were similar to claims that the Court previously ruled as abstract. The results-oriented claim language failed to concretely recite how the claimed invention improved the functionality of video surveillance systems and was therefore abstract. Regarding Alice step two, the Court analyzed the claim elements, both individually and as an ordered combination in light of the specification, for transformative elements. The Court explained that although the claims recited the purported inventive solution and referenced specific tools/parameters, they neither showed how monitoring and storage was improved nor required anything other than off-the-shelf, conventional computer, network and display technology for gathering, sending and presenting the specified information.

Procedurally, the Federal Circuit found that the motion to dismiss was not decided prematurely because the technology briefing was purely a procedural step conducted in each patent case and there was no evidence that the district court’s decision hinged on new facts constituting matters beyond the pleadings. Hawk had argued that because the district court considered Castle’s testimony and evidence, it was required to convert the [...]

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All the Benefits of a Reverse Triangular Merger, None of the IP Merger Mess

by Benjamin Ediger, Ph.D. | Mar 2, 2023 | Uncategorized

The US Court of Appeals for the Eleventh Circuit affirmed a district court’s summary judgment dismissal of plaintiff’s claim that the defendant failed to provide a payment conditioned on the sale, merger or transfer of certain intellectual property since ownership was not transferred via the merger. GSE Consulting, Inc. v. L3Harris Techs., Inc., Case No. 22-10647 (11th Cir. Feb. 8, 2023) (Rosenbaum, Lagoa, Wetherell, JJ.)

L3Harris specializes in defense and information technology and until recently was known as Harris Corporation. The name change from Harris to L3Harris was the result of a reverse triangular merger it executed over 2018 and 2019 whereby its subsidiary, Leopard Merger Sub, merged with its target, L3 Technologies.

In 2008, Harris and GSE combined forces to develop an oil sands heavy oil recovery process. In addition to yielding intellectual property relating to the process’s corresponding radio frequency heating technology, the collaboration resulted in a consulting agreement that would have extended through December 31, 2022. Under the consulting agreement, GSE provided its specialized infrastructure and energy consulting services on call and assigned all its rights to intellectual property developed under the agreement to Harris. In return, GSE received base pay and the right of first refusal for 10% of the direct labor workshare of Harris’s radio frequency heating projects.

The consulting agreement also included several payment conditions to benefit GSE or mitigate its risk. GSE believed that the Harris-L3 merger triggered the following condition to the tune of $4 million:

6.b. Payments calculation for the following to be 3% of market capitalization, capped at $4M:

in the event the IP is sold, merged or transferred and the primary basis of the sale is not the IP.

GSE argued that the intellectual property relevant to the consulting agreement had “merged” because the Harris-L3 plan of merger addressed that intellectual property and included it in the merger. GSE therefore issued a $4 million invoice to L3Harris.

L3Harris rejected the invoice, arguing that while the plan of merger addressed the relevant intellectual property, the relevant language declared that the merger would have no effect on Harris and L3’s respective ownership interests: “all such rights will survive unchanged after the consummation of the [merger].” According to L3Harris, ownership of the relevant intellectual property did not change through the merger. Not long after rejecting GSE’s invoice, L3Harris also shut down its radio frequency heating program.

GSE subsequently filed a lawsuit alleging breach of contract, and the parties filed competing summary judgment motions. GSE maintained its position that it was owed $4 million but also argued that if the district court found the payment provision ambiguous then it should consider testimony from those who brokered the agreement demonstrating that a corporate merger was sufficient to trigger payment. L3Harris argued that the provision was unambiguous and thus Florida law prohibited considering extrinsic evidence. L3Harris also argued that its merger didn’t involve anything that triggered payment (i.e., the relevant intellectual property was not sold, merged or transferred).

The district court granted [...]

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DC Circuit to Disputes Ancillary to Patent Matters: “You Can’t Sit with Us”

by Jake B. Vallen | Mar 2, 2023 | Patents

For the first time, the US Court of Appeals for the District of Columbia Circuit addressed whether appeals of discovery orders ancillary to a patent suit are within the exclusive jurisdiction of the US Court of Appeals for the Federal Circuit. The DC Circuit joined its sister circuits and held in the affirmative. Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. v. Sirius XM Radio Inc., Case No. 22-7001 (DC Cir. Feb. 17, 2023) (Srinivasan, Henderson, JJ., Edwards, Sr. J.)

In February 2017, Fraunhofer-Gesellschaft Zur Förderung commenced a civil action for patent infringement against Sirius XM Radio in the District of Delaware. During discovery, Fraunhofer subpoenaed for deposition Sirius XM’s former Chief of Marketing Officer, My-Chau Nguyen, a resident of Washington, DC.

After Nguyen failed to appear for her deposition, she filed a motion in the US District Court for the District of Columbia to quash the subpoena. Fraunhofer responded with a cross-motion to compel Nguyen’s deposition and a motion for sanctions. The DC district court denied Nguyen’s motion to quash, ordered her to sit for deposition, found her in contempt for failing to appear for deposition in the first instance, and expressed an intent to award sanctions upon Fraunhofer’s submission of documentation reflecting fees and costs. Fraunhofer appealed to the DC Circuit.

The DC Circuit first addressed whether it had jurisdiction to consider Nguyen’s challenge to the district court’s order compelling her deposition in light of the fact that Nguyen’s deposition had already been taken at the time of appeal. The Court held that Nguyen’s challenge was moot because “[n]umerous courts have held that an appeal from enforcement of a subpoena becomes moot once the party has complied with the subpoena.” Therefore, the Court reasoned that it lacked jurisdiction to consider Nguyen’s subpoena challenge because she had already complied with the subpoena at the time of the appeal.

Next, the Court addressed whether it had jurisdiction to assess the merits of Nguyen’s challenge to the district court’s finding of contempt and intent to award sanctions. The Court determined that it did not have subject matter jurisdiction to consider these issues. The Court explained that because “the underlying litigation between Fraunhofer and Sirius XM in the District of Delaware arises under an Act of Congress relating to patents[,]” Nguyen’s discovery dispute in the DC district court was “ancillary to a patent suit.” The DC Circuit reasoned that only the Federal Circuit is vested with jurisdiction over appeals “arising under . . . any Act of Congress related to patents[.]” (28 U.S.C. § 1295(a)(1).) Holding similarly to other circuits, the Court concluded that because Nguyen’s discovery dispute was ancillary to a patent matter, the ability to decide the merits of her appeal was solely within the province of the Federal Circuit.

The DC Circuit found that it did not have the authority to transfer Nguyen’s challenges to the Federal Circuit, however. The DC Circuit concluded that it was forced to dismiss rather than transfer because “this appeal could not have been brought [...]

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When It Comes to Claim Construction, Prosecution History and Specification Rule

by Thomas DaMario | Feb 23, 2023 | Patents

Addressing claim constructions across two patents that ultimately led to noninfringement findings by a district court, the US Court of Appeals for the Federal Circuit affirmed one construction because it was supported by the prosecution history but reversed another because it was unsupported by the specification. SSI Techs., LLC v. Dongguan Zhengyang Elec. Mech. Ltd., Case Nos. 21-2345, 22-1039 (Fed. Cir. Feb. 13, 2023) (Reyna, Bryson, Cunningham, JJ.)

SSI owns two patents directed to sensors for determining the characteristics of fluid in a container such as a fuel tank. One patent, referred to as the transducer patent, describes an exemplary sensor system containing a “level” transducer and a “quality” transducer. The two transducers use ultrasonic sound waves and time of flight to determine both a level of fluid in a given tank and a quality (i.e., concentration of diesel exhaust fluid). The other patent, referred to as the filter patent, describes a similar system but attempts to address the problem of erratic measurement results that may occur because of air bubbles embedded in the fluid. This patent claims a “filter” covering the sensing area that substantially prohibits gas bubbles from entering the sensing area.

Dongguan Zhengyang Electronic Mechanical (DZEM) produces systems that determine the quality and volume of diesel exhaust fluid that are used in emission-reduction systems for diesel truck engines. SSI accused DZEM of infringing both patents. In the district court action, DZEM brought a motion for summary judgment of noninfringement based on the court’s construction of certain terms that appear in the asserted claims. With reference to the transducer patent, the claims recite the need to “determine whether a contaminant exists in the fluid based on . . . a dilution of the fluid [] detected while the measured volume of the fluid decreases.” The district court determined that this claim element required that the contaminant determination actually consider the measured volume of the fluid. The district court predicated its determination on the prosecution history, having found that this term was amended to include the disputed term and that the applicant’s intention was to incorporate the specific error-detection capability recited in the specification. The parties had previously agreed that the DZEM products did not base the contamination determination on any consideration of the measured volume. As a result, the district court granted DZEM’s motion for summary judgment of noninfringement on the transducer patent.

Regarding the filter patent, the district court adopted DZEM’s construction of the term “filter,” which was “a porous structure defining openings, and configured to remove impurities larger than said openings from a liquid or gas passing through the structure.” DZEM’s accused sensors includes a rubber cover with four apertures. The district court found that the rubber cover was not “porous” because the apertures were “relatively large” when compared with the disclosed embodiments in the specification. As a result, the court granted DZEM’s motion for summary judgment of noninfringement on the filter patent. SSI appealed.

SSI challenged both constructions. Regarding the transducer patent, SSI argued that [...]

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