In a significant outcome for the wireless audio industry, the U.S. Court of Appeals for the Federal Circuit dismissed Koss Corporation’s appeal on July 19, 2024, affirming that U.S. Patent No. 10,368,155 B2 — covering a system with wireless earphones — is unpatentable. The case, filed August 2, 2022 (Case No. 22-2090), pitted Koss, a veteran consumer audio company, against Bose Corporation, one of the most prominent names in premium audio hardware. The Federal Circuit’s ruling, reached after 717 days of proceedings, closed the door on Koss’s attempt to enforce this wireless earphone patent against its rival.

This outcome carries material implications for IP strategists and R&D teams operating in the rapidly expanding true-wireless and wireless audio market. With a finding of unpatentability as the basis of termination, the decision signals continued judicial and post-grant scrutiny of wireless audio system patents — particularly those whose claims overlap with rapidly evolving prior art landscapes. Patent attorneys, in-house IP counsel, and product engineers at companies developing wireless earphone systems should examine their own portfolios and freedom-to-operate positions in light of this ruling.

Case Overview

The Parties

The Patent at Issue

U.S. Patent No. 10,368,155 B2 (application number US16/182927) covers a system architecture for wireless earphones, broadly directed at how wireless audio devices communicate, pair, and deliver audio content to users. The patent’s key claims likely encompass the signal transmission, connectivity management, or audio processing methods that distinguish a wireless earphone system from prior wired or simpler wireless implementations. In practical terms, the technology is relevant to the design and operation of Bluetooth or proprietary-wireless in-ear audio products of the kind now commonplace in the consumer electronics market.

• • US10368155B2

Legal Representation

Plaintiff Counsel: K&L Gates, LLP (lead: Brian Paul Bozzo)
Defendant Counsel: Wolf Greenfield & Sacks PC (lead: Gregory S. Nieberg)

Litigation Timeline & Procedural History

The case was heard by the U.S. Court of Appeals for the Federal Circuit, the specialized appellate court with exclusive jurisdiction over patent matters, indicating that this was an appeal from a lower-level determination — most likely a Patent Trial and Appeal Board (PTAB) inter partes review or ex parte reexamination — that had already found the patent claims unpatentable. The Federal Circuit’s involvement as the reviewing court underscores the high-stakes nature of the patentability challenge: a ruling at this level carries binding precedential weight across all U.S. patent litigation venues and sets the standard for how similar wireless audio claims will be evaluated going forward.

The proceedings spanned 717 days from filing on August 2, 2022, to closure on July 19, 2024 — a duration consistent with a substantive Federal Circuit appeal involving full briefing, oral argument scheduling, and deliberation rather than a quick procedural dismissal. The case was ultimately resolved on the basis of unpatentability, meaning the court affirmed that the claims of US10368155B2 did not meet the legal standards required for patent protection, likely on grounds such as anticipation or obviousness in view of prior art. No damages award or injunctive relief was at issue given the procedural posture; the central question was the patent’s validity, not infringement remedies.

The Verdict & Legal Analysis

Outcome

The Court of Appeals for the Federal Circuit dismissed Koss Corporation’s appeal and affirmed the finding that U.S. Patent No. 10,368,155 B2 is unpatentable, effectively canceling the patent claims at issue. Because the case was resolved on patentability grounds rather than infringement liability, no damages were awarded, no injunctive relief was ordered, and no royalty determinations were made. The unpatentability finding removes US10368155B2 from Koss’s enforceable wireless earphone patent portfolio as of the July 19, 2024 closure date.

Verdict Cause Analysis

The Federal Circuit’s dismissal turned on a finding of unpatentability — an invalidity or cancellation action that examined whether the patent’s claims satisfied the substantive requirements of U.S. patent law.

• The basis of termination was unpatentability, meaning the Federal Circuit found that the claims of US10368155B2 failed to satisfy one or more requirements under 35 U.S.C. §§ 102 (novelty) or 103 (non-obviousness), most likely in the context of a PTAB post-grant proceeding on appeal.
• Wireless earphone system patents face a particularly dense prior art field, as rapid industry development by companies including Apple, Sony, and Bose itself has produced voluminous prior art that can be mapped against broad system-level claims.
• The Federal Circuit’s affirmance of unpatentability in an invalidity/cancellation action carries immediate practical effect — unlike a district court invalidity finding, which applies only inter partes, a PTAB cancellation affirmed on appeal extinguishes the patent claims as to all parties.
• Koss’s use of K&L Gates, LLP as litigation counsel, opposing Wolf Greenfield & Sacks PC for Bose, reflects high-value strategic representation on both sides, suggesting the patent was considered commercially significant enough to litigate through the appellate level despite the invalidity risk.

Legal Significance

1. The Federal Circuit’s affirmance establishes that the specific wireless earphone system architecture claimed in US10368155B2 was not sufficiently inventive to merit patent protection, providing a useful data point for evaluating the validity risk of similarly drafted wireless audio system claims.
2. This outcome reinforces the trend of courts and the PTAB applying rigorous scrutiny to consumer wireless technology patents, particularly where broad system-level claims are challenged against a rapidly evolving prior art base — a signal that patent drafters in this space must anchor claims to highly specific, non-obvious technical differentiators.
3. For pending litigation and licensing negotiations involving Koss’s wireless audio portfolio, the cancellation of US10368155B2 may affect the perceived strength of related family members and could influence claim construction or validity assessments in co-pending proceedings against other defendants.

Strategic Takeaways

For Patent Attorneys:

• When prosecuting wireless audio or consumer electronics patents, draft claims at multiple levels of specificity to ensure that even if broad system claims are invalidated at the PTAB, narrower dependent claims with concrete technical differentiators survive post-grant review.
• Before asserting wireless earphone patents at scale — as Koss has done across multiple defendants — conduct a thorough validity assessment against the dense prior art field, including international patent filings from major audio OEMs, to accurately price the risk of a PTAB petition and Federal Circuit appeal.
• The Koss v. Bose Federal Circuit outcome should be reviewed as part of any due diligence on the Koss wireless audio patent portfolio, as the cancellation of US10368155B2 may signal vulnerability in related continuation or divisional applications sharing the same specification.

For IP Professionals:

• In-house IP teams in the consumer audio and wireless device space should use this Federal Circuit ruling as a trigger to audit their own portfolio for claims that parallel the architecture covered by US10368155B2, identifying and strengthening any patents that could face similar invalidity challenges.
• Licensing teams negotiating royalty arrangements for wireless earphone technology should factor in the heightened post-grant cancellation risk demonstrated by this case and consider structuring agreements with validity carve-outs or reduced royalty rates tied to patent survival.

For R&D Teams:

• R&D and product engineering teams developing wireless earphone systems can treat the cancellation of US10368155B2 as a potential freedom-to-operate signal for the specific architecture it claimed, but should confirm with patent counsel that their implementation falls outside any surviving Koss patent family members before proceeding.
• Given the contested IP landscape in wireless audio, engineering teams should document design decisions and maintain detailed technical records that could support a design-around strategy or provide evidence of independent development if other Koss wireless audio patents are later asserted.