Yiwu Meidi v. Waters Industries: Lighted Hat Patent Case Dismissed With Prejudice
Yiwu Meidi E-commerce filed suit against Waters Industries in the Northern District of Illinois asserting US11478035B2, a patent covering lighted hats. After 418 days of litigation, both parties jointly agreed to dismiss the case with prejudice, each bearing its own legal costs — a resolution that permanently bars refiling.
Lighted Headwear Patent Ends in Permanent Joint Dismissal
On July 13, 2024, Yiwu Meidi E-commerce Co., Ltd. and co-plaintiff Shenzhen Xinjia Yu Rubber & Plastic Co., Ltd. filed a patent infringement action against Waters Industries, Inc. in the U.S. District Court for the Northern District of Illinois, Case No. 1:24-cv-05928, before Judge Martha M. Pacold. The suit asserted US11478035B2, a patent directed to lighted hat technology, against Waters Industries’ alleged commercialisation of competing illuminated headwear products.
After 418 days, the parties filed a joint stipulation of dismissal pursuant to Fed. R. Civ. P. 41(a)(1)(A)(ii), dismissing the case with prejudice on September 4, 2025. A with-prejudice dismissal is final: Yiwu Meidi and its co-plaintiff are permanently barred from reasserting the same claims against Waters Industries in federal court. Crucially, each party agreed to bear its own costs and fees, meaning neither side received a cost award — a common hallmark of a negotiated commercial resolution.
The 418-day duration, combined with the mutual cost-bearing arrangement and with-prejudice finality, is consistent with a private settlement reached after meaningful litigation activity, though the public record does not confirm any financial terms. The absence of a fee-shifting award suggests neither party pressed for an exceptional-case finding under 35 U.S.C. § 285. What drove the ultimate resolution — claim construction disputes, validity concerns, or commercial compromise — remains undisclosed on the docket.
Filing to Dismissed with Prejudice in 418 days
418 days — longer than the median voluntary dismissal in N.D. Illinois patent cases, suggesting substantive negotiation before resolution.
Dismissed with prejudice: what the joint stipulation means for both parties
Rule 41 joint stipulation — permanent, court-order-free dismissal
Under Fed. R. Civ. P. 41(a)(1)(A)(ii), parties may jointly dismiss a case without a court order once all appearing parties sign the stipulation. A with-prejudice designation makes the dismissal final on the merits — Yiwu Meidi cannot refile the same infringement claims against Waters Industries in any federal district court. No judicial finding on patent validity or infringement was made.
Voluntary — no merits adjudicationPlaintiff permanently surrenders the right to re-sue Waters Industries
By agreeing to dismissal with prejudice, Yiwu Meidi and Shenzhen Xinjia Yu forgo any future federal infringement claim on US11478035B2 against Waters Industries. US11478035B2 itself remains in force and can still be asserted against other defendants. The with-prejudice bar applies only to this specific defendant. Whether any licence, royalty stream, or product change was negotiated privately is not reflected in the public record.
Patent survives — defendant-specific barWaters Industries receives permanent immunity from this infringement claim
Waters Industries secures a with-prejudice dismissal, which functions as a complete shield against re-assertion of US11478035B2 claims by these plaintiffs. The company avoided a merits ruling, preserving its ability to argue invalidity or non-infringement in any future dispute with other patent holders. The mutual cost-bearing term means Waters Industries absorbed its own legal spend, consistent with a negotiated exit rather than a litigated win.
Permanent bar — no validity rulingUS11478035B2 remains a live enforcement risk for other lighted headwear players
Because no court ruled on validity or claim scope, US11478035B2 retains full presumption of validity under 35 U.S.C. § 282. Other manufacturers or importers of illuminated headwear products cannot rely on this dismissal as prior art, an invalidity finding, or a non-infringement determination. Companies in the lighted hat and illuminated accessories segment should treat this patent as an active enforcement asset and consider freedom-to-operate analysis.
Patent enforceable — FTO analysis advisedFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Yiwu Meidi E-commerce Co., Ltd | Company | Chinese e-commerce and manufacturing entity — holder of US11478035B2 (lighted hats)Search in Eureka ↗ |
| Defendant | Waters Industries | Company | Waters Industries, Inc. — U.S.-based manufacturer/distributor of consumer headwear productsSearch in Eureka ↗ |
| Plaintiff counsel | Dandan Pan | Attorney | Counsel for Yiwu Meidi E-commerce Co., LtdSearch in Eureka ↗ |
| Plaintiff counsel | Ruoting Men | Attorney | Counsel for Yiwu Meidi E-commerce Co., LtdSearch in Eureka ↗ |
| Plaintiff counsel | Tao Liu | Attorney | Counsel for Yiwu Meidi E-commerce Co., LtdSearch in Eureka ↗ |
| Plaintiff counsel | Xionghui Murong | Attorney | Counsel for Yiwu Meidi E-commerce Co., LtdSearch in Eureka ↗ |
| Plaintiff law firm | Glacier Law LLP | Law Firm | Representing Yiwu Meidi E-commerce Co., LtdSearch in Eureka ↗ |
| Defendant counsel | Glenn Rice | Attorney | Counsel for Waters IndustriesSearch in Eureka ↗ |
| Defendant counsel | Vance L. Liebman | Attorney | Counsel for Waters IndustriesSearch in Eureka ↗ |
| Defendant law firm | Funkhouser Vegosen Liebman & Dunn, Ltd. | Law Firm | Representing Waters IndustriesSearch in Eureka ↗ |
| Presiding judge | Judge Martha M. Pacold | Judge | Illinois Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The joint stipulation language — ‘hereby jointly dismiss this case with prejudice, each party shall bear its own costs and fees’ — is deliberately bilateral and neutral. It contains no admission of liability, no infringement finding, and no validity determination. The with-prejudice designation forecloses refiling by these specific plaintiffs against this specific defendant, but does not affect the patent’s enforceability against the wider market. The mutual cost-bearing clause is commercially significant: it signals that neither party claimed litigation victory, and courts have declined to treat such arrangements as exceptional-case triggers under § 285.
US11478035B2 — Illuminated Headwear Technology
US11478035B2, filed under Application No. 16/934746, covers technology directed to lighted hats — headwear incorporating integrated illumination systems. The patent issued as a utility patent and is the sole asserted patent in this infringement action. Utility patents of this type typically protect structural configurations, electrical integration methods, or aesthetic-functional combinations that distinguish illuminated headwear from prior art designs. The specific claim scope of US11478035B2 was never publicly adjudicated in this proceeding.
From a strategic standpoint, US11478035B2 represents an assertion asset in the consumer novelty and outdoor accessories market — a category that has seen growing patent activity driven by low-cost manufacturing combined with U.S. IP registration. The patent holder’s willingness to litigate in federal court signals active enforcement intent. Any manufacturer, importer, or retailer of lighted or illuminated headwear should assess potential exposure, particularly given that the dismissal here creates no prior art or invalidity precedent that competitors can rely upon.
Should your product team run an FTO against US11478035B2?
If your company designs, imports, manufactures, or retails lighted hats, illuminated caps, or any headwear incorporating integrated lighting elements, US11478035B2 is a live risk. The patent has been actively enforced in federal court, and the dismissal in this case provides no shield for third parties. Product teams launching new SKUs in lighted accessories, smart headwear, or novelty illuminated apparel should commission a freedom-to-operate analysis before commercialisation — particularly if sourcing from Chinese manufacturers operating in the same supply chain as the parties to this dispute.
PatSnap Eureka’s FTO Search Agent can map US11478035B2’s claim scope against your product specifications, identify continuation or divisional family members that may extend coverage, and surface competing patents in the illuminated headwear landscape. Eureka can also generate prior art candidate sets relevant to validity assessment, helping your legal team evaluate the strength of the patent before deciding whether to design around, seek a licence, or challenge validity at the USPTO via IPR or ex parte reexamination.
Run a freedom-to-operate analysis on US11478035B2 to assess your product’s exposure
Run FTO in Eureka →Similar Lighted Headwear & Consumer Accessory Patent Cases
Patent infringement cases involving illuminated headwear and consumer accessory patents filed in the Northern District of Illinois with comparable dismissal outcomes.
What this case signals for the illuminated headwear IP landscape
A with-prejudice exit after 418 days leaves US11478035B2 intact and enforceable — the broader market cannot treat this outcome as clearance.
No merits ruling means the patent’s validity is untested in court
The joint dismissal produced zero judicial commentary on claim construction, obviousness, or infringement. US11478035B2 carries full statutory presumption of validity. Competitors operating in the lighted headwear space should not interpret this dismissal as market clearance — the patent remains a credible enforcement vehicle against third parties.
Mutual cost-bearing signals a negotiated resolution, not a litigation win
When neither party recovers costs, it typically signals that both sides found more value in a commercial resolution than continued litigation. This pattern — lengthy negotiation, with-prejudice dismissal, no fee award — is consistent with a private settlement or licence arrangement, though the public record does not confirm any financial terms.
Yiwu v Waters — key questions answered
The with-prejudice dismissal bars Yiwu Meidi and its co-plaintiff from refiling infringement claims against Waters Industries under US11478035B2. However, the patent itself remains valid and enforceable against all other parties. No court made any finding on claim scope, validity, or infringement, so third parties cannot rely on this outcome as a clearance determination.
US11478035B2 (Application No. 16/934746) was the sole patent asserted. It covers lighted hat technology — headwear with integrated illumination systems. The precise claim scope was not adjudicated in this proceeding, as the case settled before any merits ruling.
Mutual cost-bearing — where neither side recovers attorneys’ fees or expenses — is a common feature of negotiated resolutions in patent litigation. It typically indicates that both parties found the commercial terms of resolution preferable to the cost and risk of continued litigation. It also avoids any exceptional-case fee award under 35 U.S.C. § 285, which requires a finding of litigation misconduct or a frivolous position.
The with-prejudice dismissal protects Waters Industries only against these specific plaintiffs asserting US11478035B2. It does not provide any defence against claims by other patent holders or on other patents. Waters Industries also made no admissions regarding infringement or validity, preserving its ability to contest such issues in any future proceeding.
The Northern District of Illinois is an active patent litigation venue, particularly for consumer product and e-commerce related cases involving Chinese IP holders. Filing in N.D. Illinois may reflect where Waters Industries is incorporated or conducts business, where infringing sales occurred, or a strategic venue selection. Judge Martha M. Pacold presided, though no substantive rulings were published before dismissal.
PatSnap Eureka searches patents and litigation data to answer instantly.