Koss Corp. v. Bose Corp.: Wireless Headphone Patent Suit Dismissed After 1,569 Days
Koss Corporation filed suit against Bose Corporation in December 2020, asserting three wireless headphone patents against Bose’s SoundSport and QC 35 product lines. Judge Richard G. Stearns of the Massachusetts District Court granted Bose’s motion to dismiss on March 28, 2025 — ending a case that ran for over four years.
Koss’s Four-Year Campaign Against Bose Ends in Dismissal
Koss Corporation, a Milwaukee-based consumer electronics company and longstanding wireless audio patent holder, filed this action against Bose Corporation on December 10, 2020 in the District of Massachusetts. Koss asserted three patents — US10206025B2, US10469934B2, and US10368155B2 — covering wireless headphone technologies, against Bose’s SoundSport and QC 35 headphone product lines. The case was assigned to Judge Richard G. Stearns and litigated under the posture of a declaratory judgment proceeding.
On March 28, 2025, Judge Stearns entered an order granting Bose’s motion to dismiss, and the case was formally closed the same day. The basis of termination is recorded as ‘Case Dismissed,’ with the verdict referencing the court’s order at Doc. No. 31. The dismissal does not appear, from the public record, to specify ‘with prejudice’ or ‘without prejudice’ in the docket-level termination data available, though the granting of a motion to dismiss typically carries legal weight as to the specific claims and theories presented.
A duration of 1,569 days — more than four years — is notably extended for a district court patent matter that ultimately resolved on a motion to dismiss rather than at trial. This timeline may suggest substantial pre-dismissal motion practice, claim construction proceedings, or parallel proceedings such as IPR petitions that are common in Koss’s broader patent enforcement campaign. What specifically drove the court’s dismissal ruling — whether on standing, subject-matter eligibility, or another ground — is not fully detailed in the available public record and would require review of Doc. No. 31.
Filing to Case Dismissed in 1569 days
1,569 days litigated — well above the median district court patent case duration of ~730 days
Bose’s motion to dismiss granted: what the ruling means for both parties
Dismissal on motion: no merits adjudication on infringement
The court granted Bose’s motion to dismiss under Doc. No. 31, ending the action without a trial or infringement finding. A dismissal on motion typically means the court found a threshold legal deficiency — such as lack of standing, failure to state a claim, or subject-matter ineligibility — before reaching the substantive question of whether Bose’s products infringed Koss’s patents. The specific grounds are not disclosed in the available public termination data.
Motion to dismiss grantedWith or without prejudice? The public record is silent
The docket termination basis is recorded simply as ‘Case Dismissed,’ without specifying whether the dismissal was with or without prejudice. This distinction is material: a dismissal with prejudice bars Koss from re-filing the same claims, while a dismissal without prejudice would preserve that option. The granting of a defendant’s motion to dismiss is often — though not always — with prejudice, particularly where the deficiency is substantive rather than procedural. Practitioners should review Doc. No. 31 directly to confirm the prejudice status before advising clients.
Prejudice status unconfirmedBose exits without an infringement finding on the merits
Bose Corporation secured dismissal of Koss’s claims without facing a liability determination on patent infringement. For Bose’s SoundSport and QC 35 product lines, this outcome removes the immediate litigation risk under these three patents — at least in this proceeding. However, unless the dismissal is with prejudice or the patents are separately invalidated, Bose’s freedom-to-operate position under the Koss portfolio should be evaluated carefully, particularly given Koss’s history of parallel enforcement actions.
No infringement findingKoss’s broader wireless audio patent strategy remains active
This dismissal is one data point in Koss’s wider enforcement campaign across the wireless headphone sector. Companies designing or selling Bluetooth and wireless audio products should note that the underlying patents — US10206025B2, US10469934B2, and US10368155B2 — remain in force unless separately challenged or expired. A procedural dismissal in one case does not extinguish patent rights. Competitors and product teams operating in the wireless audio market should maintain active FTO monitoring against the Koss portfolio.
Patents remain in forceFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Koss, Corp. | Company | Consumer electronics company — holder of US10206025B2, US10469934B2, US10368155B2Search in Eureka ↗ |
| Defendant | Bose Corp. | Company | Bose Corporation — premium audio hardware manufacturer, maker of SoundSport and QC 35 headphonesSearch in Eureka ↗ |
| Plaintiff counsel | Benjamin E. Weed | Attorney | Counsel for Koss, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Brandon R. Dillman | Attorney | Counsel for Koss, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Darlene F. Ghavimi | Attorney | Counsel for Koss, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Erik J. Halverson | Attorney | Counsel for Koss, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Gina A. Johnson | Attorney | Counsel for Koss, Corp.Search in Eureka ↗ |
| Plaintiff counsel | John C. Blessington | Attorney | Counsel for Koss, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Melissa M. Haulcomb | Attorney | Counsel for Koss, Corp.Search in Eureka ↗ |
| Plaintiff counsel | Peter E. Soskin | Attorney | Counsel for Koss, Corp.Search in Eureka ↗ |
| Plaintiff law firm | K&L Gates LLP | Law Firm | Representing Koss, Corp.Search in Eureka ↗ |
| Plaintiff law firm | Meyers Nave | Law Firm | Representing Koss, Corp.Search in Eureka ↗ |
| Defendant counsel | Michael N. Rader | Attorney | Counsel for Bose Corp.Search in Eureka ↗ |
| Defendant counsel | Nathan R. Speed | Attorney | Counsel for Bose Corp.Search in Eureka ↗ |
| Defendant law firm | Wolf Greenfield & Sacks PC | Law Firm | Representing Bose Corp.Search in Eureka ↗ |
| Presiding judge | Judge Richard G. Stearns | Judge | Massachusetts District CourtSearch in Eureka ↗ |
Official order — verbatim text
The verdict text — ‘granting Defendants Motion to Dismiss… it is hereby ORDERED that the above-entitled action be and hereby is DISMISSED’ — is a procedural termination order rather than a substantive ruling on infringement or validity. The court acted on Bose’s motion, suggesting Bose identified a cognisable threshold deficiency in Koss’s claims. Critically, no infringement finding, damages award, or claim construction ruling accompanies this dismissal, meaning the patents’ commercial scope and validity remain judicially untested in this proceeding. The public record does not confirm whether dismissal was with or without prejudice.
US10206025B2, US10469934B2 & US10368155B2 — Wireless Headphone Technology Patents
The three patents asserted by Koss — US10206025B2 (App. No. 15/962305), US10469934B2 (App. No. 16/375879), and US10368155B2 (App. No. 16/182927) — sit within Koss’s portfolio covering wireless audio headphone technology. These continuation-style application numbers suggest a family strategy designed to extend coverage across headphone audio streaming, wireless connectivity, and related control mechanisms. Koss, which holds early priority dates in wireless headphone technology, has positioned these patents as foundational to modern Bluetooth and wireless audio product design.
The commercial significance of these patents lies in their asserted applicability to mainstream consumer headphone products — here, Bose’s SoundSport and QC 35 lines, among the most commercially successful wireless headphone products globally. This suggests Koss views the patents as broadly applicable to any manufacturer implementing wireless audio streaming in consumer headsets. For companies in the wireless audio space — including earbuds, over-ear headphones, and hearing device manufacturers — the scope of the Koss portfolio represents a persistent enforcement risk that a single dismissal does not resolve.
Should you run an FTO against US10206025B2, US10469934B2 & US10368155B2?
Any company designing, manufacturing, or distributing wireless headphone products — including TWS earbuds, over-ear Bluetooth headphones, sports audio devices, or integrated audio wearables — should assess freedom-to-operate against these three Koss patents. Koss has demonstrated a willingness to pursue major OEMs, making it likely that mid-tier brands and ODMs are also within enforcement scope. A litigation dismissal without prejudice or merits ruling does not create a safe harbour for third parties.
PatSnap Eureka’s FTO Search Agent can map your product’s technical claims against the full Koss wireless headphone patent family, identify potentially blocking claims in US10206025B2, US10469934B2, and US10368155B2, and surface prior art that could support IPR petitions. Eureka’s citation graph and family analysis tools also allow you to track continuation applications from these three patents — identifying future enforcement vectors before they become active threats.
Run a freedom-to-operate analysis on US10206025B2 to assess your product’s exposure
Run FTO in Eureka →Similar Wireless Headphone Patent Cases in US District Courts
Cases involving Koss’s wireless headphone patent portfolio and comparable audio technology disputes in Massachusetts and other US district courts.
What this case signals for the wireless audio IP landscape
A four-year dismissal without a merits ruling leaves significant IP risk unresolved for the wireless headphone sector.
Koss’s enforcement pattern warrants portfolio-level monitoring
Koss has pursued multiple defendants across its wireless headphone patent portfolio. A dismissal in one case does not neutralise the threat — companies in the wireless audio space should map their products against the full Koss patent family, not just the three patents asserted here, to assess ongoing exposure.
Motion to dismiss outcomes leave patent validity questions open
Because this case ended on a threshold motion rather than at claim construction or trial, there is no judicial ruling on the validity or scope of US10206025B2, US10469934B2, or US10368155B2. Competitors cannot rely on this outcome as a shield. Validity challenges via IPR or ex parte reexamination may remain the most reliable path to clearing these patents.
Koss v Bose — key questions answered
Koss Corporation filed suit against Bose Corporation in December 2020 in the Massachusetts District Court, asserting three wireless headphone patents. Judge Richard G. Stearns granted Bose’s motion to dismiss on March 28, 2025, ending the case after 1,569 days without a merits ruling on infringement or validity.
Koss asserted US10206025B2 (App. No. 15/962305), US10469934B2 (App. No. 16/375879), and US10368155B2 (App. No. 16/182927) — three patents covering wireless headphone technology — against Bose’s SoundSport and QC 35 headphone product lines.
The publicly available docket termination data records the basis as ‘Case Dismissed’ without specifying with or without prejudice. The full terms would require review of Doc. No. 31, the court’s order granting Bose’s motion to dismiss. This distinction is commercially material and should be confirmed before drawing conclusions about Koss’s ability to re-file.
The accused products were Bose’s SoundSport wireless headphones and the QC 35 series wireless headphone products. Both are Bluetooth-enabled consumer audio devices. The case ended on a motion to dismiss before any infringement determination was made regarding these specific products.
No. The dismissal was procedural — granted on Bose’s motion to dismiss — and does not constitute a ruling on the validity or enforceability of US10206025B2, US10469934B2, or US10368155B2. The patents remain in force unless separately challenged at the USPTO or declared invalid by a court. Third parties cannot rely on this outcome as a validity determination.
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