E Vision LLC v. Seiko Epson Corp. — Smart Glasses Patent Dispute Dismissed With Prejudice
E Vision LLC asserted three patents against Epson’s Moverio line of smart glasses before the California Central District Court. After 574 days of litigation, the parties jointly stipulated to dismiss all claims with prejudice and no award of costs or attorneys’ fees to either side.
Three-Patent Smart Glasses Dispute Ends in Bilateral Stipulated Dismissal
E Vision LLC filed suit against Seiko Epson Corporation and its U.S. subsidiary Epson America, Inc. on October 3, 2023 in the Central District of California, asserting infringement of three U.S. patents — US8931896B2, US8905541B2, and US10795411B2 — directed to wearable display and smart glasses technology. The accused products spanned five Moverio-branded smart glasses models: the BT-35E, BT-35ES, BT-40, BT-45C, and BT-45CS.
The case closed on April 29, 2025 via a joint stipulation under Fed. R. Civ. P. 41(a)(1)(A)(ii), dismissing all claims, affirmative defenses, and counterclaims with prejudice. Crucially, neither party was awarded costs or attorneys’ fees, suggesting a negotiated resolution — likely a settlement — reached outside the court record. A dismissal with prejudice bars E Vision from re-filing the same claims against Epson on these patents.
The 574-day duration suggests the parties engaged in substantive litigation before reaching resolution, potentially including claim construction briefing or early dispositive motions. The mutual no-fees term is consistent with a privately negotiated settlement rather than a clear win on the merits for either side. The specific financial or licensing terms, if any, remain undisclosed in the public record.
Filing to Dismissed with Prejudice in 574 days
574 days — roughly 19 months, longer than the median patent dismissal timeline in C.D. Cal.
Dismissed with prejudice: what the stipulated exit means for both parties
Rule 41(a)(1)(A)(ii) dismissal with prejudice explained
A stipulated dismissal under Fed. R. Civ. P. 41(a)(1)(A)(ii) requires both parties’ signatures and is immediately effective upon filing. The ‘with prejudice’ designation is the critical qualifier — it operates as a final adjudication on the merits, meaning E Vision cannot re-litigate these exact claims against Epson on these three patents. No court order or judicial approval is required for this mechanism.
Bilateral — court-approved not requiredE Vision surrenders re-filing rights on all three patents against Epson
By agreeing to dismiss with prejudice, E Vision permanently forecloses any future infringement action against Epson based on US8931896B2, US8905541B2, and US10795411B2 for the Moverio product line. The no-costs term means E Vision receives no court-ordered monetary recovery. Whether a private licensing agreement or lump-sum settlement was reached is not disclosed in the public record, but the with-prejudice designation typically signals some form of consideration exchanged.
Re-filing barred against EpsonEpson avoids any court-ordered liability but foregoes fee recovery
Epson secures a permanent bar against E Vision re-asserting these three patents on the Moverio product range — a commercially valuable outcome for a product line spanning five active SKUs. However, Epson did not obtain an attorneys’ fees award, which suggests Epson did not pursue or succeed on an ‘exceptional case’ argument under 35 U.S.C. § 285. Epson’s patents and Moverio product line remain unaffected by any infringement finding.
No liability — no fee award eitherSmart glasses IP risk: three patents remain live for the broader market
The dismissal resolves Epson’s exposure but leaves US8931896B2, US8905541B2, and US10795411B2 fully enforceable against other wearable display manufacturers. E Vision retains the right to assert these patents against third parties, and the lack of any invalidity or non-infringement ruling means the patents emerge from this litigation without narrowing precedent. Competing smart glasses developers should treat this as an unresolved IP risk signal.
Patents survive — third parties still at riskFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | E Vision, LLC | Company | Wearable display IP licensing entity — holder of US8931896B2, US8905541B2, and US10795411B2Search in Eureka ↗ |
| Defendant | Seiko Epson, Corp. | Company | Seiko Epson Corp. and U.S. subsidiary Epson America, Inc. — makers of the Moverio smart glasses lineSearch in Eureka ↗ |
| Co-Defendant | Epson America, Inc | Company | Search in Eureka ↗ |
| Plaintiff counsel | Brian D. Hill | Attorney | Counsel for E Vision, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Britton Davis | Attorney | Counsel for E Vision, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Christopher C. Campbell | Attorney | Counsel for E Vision, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Cori Cudabac Steinmann | Attorney | Counsel for E Vision, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Jeffrey M. Telep | Attorney | Counsel for E Vision, LLCSearch in Eureka ↗ |
| Plaintiff counsel | John David Roehrick | Attorney | Counsel for E Vision, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Ojeiku C. Aisiku | Attorney | Counsel for E Vision, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Cahill Gordon and Reindel LLP | Law Firm | Representing E Vision, LLCSearch in Eureka ↗ |
| Plaintiff law firm | King & Spalding LLP | Law Firm | Representing E Vision, LLCSearch in Eureka ↗ |
| Defendant counsel | Christopher C. Campbell | Attorney | Counsel for Seiko Epson, Corp.Search in Eureka ↗ |
| Defendant counsel | Joel Gotkin | Attorney | Counsel for Seiko Epson, Corp.Search in Eureka ↗ |
| Defendant counsel | John A. Radi | Attorney | Counsel for Seiko Epson, Corp.Search in Eureka ↗ |
| Defendant counsel | Laura M. Burson | Attorney | Counsel for Seiko Epson, Corp.Search in Eureka ↗ |
| Defendant counsel | Peter T. Ewald | Attorney | Counsel for Seiko Epson, Corp.Search in Eureka ↗ |
| Defendant law firm | Cahill Gordon and Reindel LLP | Law Firm | Representing Seiko Epson, Corp.Search in Eureka ↗ |
| Defendant law firm | Omelveny And Myers, LLP | Law Firm | Representing Seiko Epson, Corp.Search in Eureka ↗ |
| Defendant law firm | Oliff PLC | Law Firm | Representing Seiko Epson, Corp.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | California Central District CourtSearch in Eureka ↗ |
Official order — verbatim text
The stipulation’s explicit reference to Fed. R. Civ. P. 41(a)(1)(A)(ii) confirms this was a consensual bilateral exit requiring no judicial finding on the merits. The ‘with prejudice’ term is significant: it functions as a final adjudication, permanently barring E Vision from re-asserting these claims against Epson. The mutual waiver of costs and fees is atypical in pure defendant victories, suggesting the resolution was commercially negotiated rather than a clean dismissal for lack of merit.
US8931896B2, US8905541B2 & US10795411B2 — Smart Glasses Wearable Display Patents
The three asserted patents — US8931896B2, US8905541B2, and US10795411B2 — relate to wearable display technology in the smart glasses and heads-up display domain. Filed across application numbers US13/779232, US13/298992, and US16/454823, the patents span different generations of wearable display innovation and collectively cover a range of optical, display, and system-level claims relevant to binocular smart glasses products of the type sold under Epson’s Moverio brand.
For the broader wearable display sector, three co-asserted patents held by a single licensing entity against a major OEM’s entire product line suggests a coordinated enforcement portfolio rather than opportunistic single-patent assertion. Any manufacturer developing smart glasses, AR headsets, or heads-up displays incorporating similar optical architectures should treat these patents as live enforcement risks. The absence of any invalidity or non-infringement ruling from this case means the patents have not been narrowed.
Should your wearable display team run an FTO against US8931896B2, US8905541B2, and US10795411B2?
Any company developing or commercialising smart glasses, AR eyewear, or heads-up display products — particularly those incorporating binocular optical systems or wearable display control architectures — should conduct a formal freedom-to-operate analysis against all three E Vision patents. The Epson dismissal provides no safe harbour for third parties, and the patents emerge from this litigation without any adverse claim construction or invalidity ruling.
PatSnap Eureka’s FTO Search Agent can map the claim language of US8931896B2, US8905541B2, and US10795411B2 against your product specifications, identify design-around opportunities, and surface any prior art that was not raised in the Epson litigation. For product teams finalising AR/smart glasses roadmaps, this analysis should precede any commercial launch or investor disclosure.
Run a freedom-to-operate analysis on US8931896B2 to assess your product’s exposure
Run FTO in Eureka →Similar smart glasses and wearable display patent cases in C.D. Cal.
Cases involving wearable display and smart glasses patent assertions in the Central District of California, including comparable multi-patent licensing entity actions against hardware OEMs.
What this case signals for the wearable display IP landscape
A three-patent assertion against a major OEM’s full smart glasses line, resolved privately after 19 months, carries clear signals for the sector.
With-prejudice dismissals often mask private licensing resolutions
When both parties agree to dismiss with prejudice and waive fee recovery, the public record rarely tells the full story. This pattern is consistent with a confidential licensing agreement or lump-sum settlement. IP teams tracking E Vision’s enforcement posture should note that the patents remain active and the assertion strategy may continue against other wearable OEMs.
Multi-product, multi-patent assertions create settlement leverage
E Vision’s decision to assert three patents against five Moverio SKUs simultaneously is a structurally aggressive approach that maximises claim surface area and complicates early dismissal. Companies in the smart glasses and heads-up display space should audit their product portfolios against all three asserted patents before launch or major product updates.
E v Seiko — key questions answered
E Vision LLC filed a patent infringement action against Seiko Epson Corp. and Epson America Inc. in the Central District of California on October 3, 2023, asserting three patents against Epson’s Moverio smart glasses line. The case was dismissed with prejudice by joint stipulation under Fed. R. Civ. P. 41(a)(1)(A)(ii) on April 29, 2025, with no award of costs or attorneys’ fees to either party.
E Vision asserted three U.S. patents: US8931896B2 (App. No. US13/779232), US8905541B2 (App. No. US13/298992), and US10795411B2 (App. No. US16/454823). All three relate to wearable display and smart glasses technology. The accused products were the Moverio BT-35E, BT-35ES, BT-40, BT-45C, and BT-45CS smart glasses.
A dismissal with prejudice is treated as a final adjudication on the merits. It permanently bars E Vision from re-filing the same patent infringement claims against Epson on US8931896B2, US8905541B2, and US10795411B2. The parties stipulated to this outcome jointly, and the mutual waiver of costs and fees suggests a privately negotiated resolution, though no settlement terms are disclosed in the public record.
Yes. The stipulated dismissal resolves only E Vision’s claims against Epson and produces no invalidity finding, no claim construction ruling, and no non-infringement determination. All three patents — US8931896B2, US8905541B2, and US10795411B2 — remain fully enforceable against third parties. Other smart glasses or AR wearable manufacturers cannot rely on this outcome as any form of protection against assertion.
The joint stipulation explicitly waived any award of costs or attorneys’ fees to either party. Under 35 U.S.C. § 285, attorneys’ fees require a finding that the case is ‘exceptional,’ which demands judicial determination. By agreeing to mutual waiver in a stipulated dismissal before any such ruling, both parties avoided that threshold — consistent with a negotiated resolution rather than a litigated outcome.
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