Merger of District Court Dismissals Torpedoes Appeal from PTAB Decision at Federal Circuit

August 21, 2024

Reading Time : 2 min

The Federal Circuit dismissed an appeal of a final written decision in an IPR based on issue preclusion where a district court had dismissed a complaint finding the patent claims subject-matter ineligible. The patentee had filed a second amended complaint, but then voluntarily dismissed the case without asking the district court to vacate its prior invalidity ruling, which it also never appealed. The Federal Circuit held that the initial invalidity order was interlocutory when issued but merged with the voluntary dismissal with prejudice, making the invalidity determination final and the present appeal moot.

The patentee was the assignee of patents for wireless earphones. It filed a patent infringement suit against a first defendant in the Western District of Texas. The same day, it also filed an infringement suit against a second defendant in the same court, asserting the same patents. The first defendant challenged venue and separately filed IPR petitions against the asserted patents.

After the PTAB issued final written decisions finding the asserted claims unpatentable, the patentee appealed. During this time, the patentee’s action against the second defendant had been transferred to the Northern District of California, which found the claims of the asserted patents invalid under 35 U.S.C. § 101 for claiming patent-ineligible subject matter, but granted the patentee leave to amend its complaint. After the patentee filed a second amended complaint and the second defendant filed a motion to dismiss, the patentee voluntarily stipulated to dismiss the suit with prejudice. In doing so, the patentee never requested that the court vacate its order of invalidity. The California court then entered an order formally dismissing the patentee’s suit with prejudice. The patentee did not appeal that order. 

Given the Northern District of California’s dismissal with prejudice, the first defendant moved to dismiss the patentees IPR appeals as moot on the grounds that the California court had already invalidated the asserted claims. The issue was thus whether the claims in the present appeal were invalid due to prejudicial dismissal by the California court, precluding the patentee from asserting those claims against the first defendant. The patentee argued that the California court's initial invalidation order was superseded by its second amended complaint. The Federal Circuit disagreed with the patentee’s argument that the district court’s invalidity ruling became null by its filing of a second amended complaint. 

According to Ninth Circuit law, prior dismissals do not need to be raised in amended complaints to be appealable. Applying this precedent, the Federal Circuit held that the patentee was able to appeal the district court’s initial invalidity order without realleging its claims in a second complaint. But here, the patentee’s right to appeal was affected by its own decision to dismiss its suit with prejudice. Thus, the California court's invalidity order merged with its final order dismissing the case with prejudice. Put differently, the invalidity order was not final and appealable when it first issued but became so when the patentee voluntarily dismissed the suit without having the invalidity order vacated. The Federal Circuit concluded that the patent claims were invalid, making the present IPR appeal moot.

Practice Tip: Parties with concurrently pending suits in different venues must be wary of judgments in those venues for potential preclusive effects. When determining whether dismissing a suit is appropriate, parties must ensure they preserve their right to appeal or risk losing the chance to assert their patents against other defendants.

Koss Corp. v. Bose Corp., 107 F.4th 1363 (Fed. Cir. July 19, 2024)

Share This Insight

Previous Entries

IP Newsflash

August 11, 2025

In considering a motion to dismiss infringement claims for two related patents, the District of Massachusetts recently held that pre-suit knowledge of a “parent” patent, without more, is insufficient to establish pre-suit knowledge of the “child” patent for purposes of indirect and willful infringement.

...

Read More

IP Newsflash

August 8, 2025

Following a jury verdict finding trade secret misappropriation, the District Court for the District of Massachusetts granted-in-part a plaintiff’s motion for a permanent injunction to prohibit defendants from using plaintiff’s trade secrets. The district court further required defendants to reassign to plaintiff patents and patent applications that disclosed or were derived from plaintiff’s trade secrets as part of its equitable relief.

...

Read More

IP Newsflash

August 6, 2025

In ruling on a recent motion to strike, a judge in the Eastern District of Texas permitted a damages expert to rely on a damages theory based on defendant’s “avoided costs,” holding that this theory did not run afoul of the “entire market value rule.”

...

Read More

IP Newsflash

August 5, 2025

The Federal Circuit recently vacated a decision by the Patent Trial and Appeal Board after concluding that the board’s analysis of licensing evidence offered as a secondary consideration of nonobviousness constituted legal error and was not supported by substantial evidence. According to the court, the board applied a more exacting and improperly heightened nexus standard than is required by law for license evidence.

...

Read More

IP Newsflash

August 5, 2025

A Northern District of California judge recently granted a motion to reconsider his summary judgment ruling that defendant was barred from raising certain “device art” due to IPR estoppel under 35 U.S.C. § 315(e)(2). In the original ruling, the judge adopted the broader rule that IPR estoppel applies to device art that is “materially identical” to patents or printed publications that petitioners raised, or could have raised, in an IPR. Following that ruling, however, the Federal Circuit issued its Ingenico decision adopting the narrower view that IPR estoppel applies only to “grounds” based on patents and printed publications and not to device-based grounds. Citing Ingenico as a “change of law,” defendant moved for reconsideration of the court’s ruling, and the court granted the motion.

...

Read More

IP Newsflash

August 5, 2025

In a recent decision designated as Informative, the USPTO Director determined that the Patent Trial and Appeal Board abused its discretion by instituting two inter partes review proceedings challenging the same patent, based on petitions advancing different constructions of the same claim term. The Director expressed concerns that permitting multiple petitions based on alternative claim constructions effectively circumvents word count limitations, strains board resources, and undermines procedural efficiency.

...

Read More

IP Newsflash

July 25, 2025

Earlier this year, the Federal Circuit’s decision in Qualcomm Inc. v. Apple Inc. (Qualcomm II) raised questions about the extent to which petitioners can rely on applicant admitted prior art (“AAPA”) in inter partes review proceedings.  The Federal Circuit’s recent decision in Shockwave Medical, Inc. v. Cardiovascular Sys., Inc. largely cabins the Qualcomm II decision to its particular facts and makes clear that AAPA can be used as evidence of background knowledge as part of an obviousness argument.

...

Read More

IP Newsflash

July 11, 2025

The Federal Circuit recently reversed a PTAB determination on remand that a patent was obvious over applicant admitted prior art (“AAPA”) in combination with prior art patents, holding that expressly designating AAPA as a “basis” for a ground is improper under 35 U.S.C. § 311(b). In doing so, the Court rejected the PTAB’s “blanket rule” that “AAPA used in combination with prior art patents or printed publications under § 311(b) is ipso facto not the basis or part of the basis of a ground.” Ultimately, while the case clarifies that expressly listing AAPA in an IPR ground is improper, the precise line between proper and improper uses of AAPA in other instances remains unclear.

...

Read More

© 2025 Akin Gump Strauss Hauer & Feld LLP. All rights reserved. Attorney advertising. This document is distributed for informational use only; it does not constitute legal advice and should not be used as such. Prior results do not guarantee a similar outcome. Akin is the practicing name of Akin Gump LLP, a New York limited liability partnership authorized and regulated by the Solicitors Regulation Authority under number 267321. A list of the partners is available for inspection at Eighth Floor, Ten Bishops Square, London E1 6EG. For more information about Akin Gump LLP, Akin Gump Strauss Hauer & Feld LLP and other associated entities under which the Akin Gump network operates worldwide, please see our Legal Notices page.