Zhejiang Natural v. Hangzhou Loutian: Self-Inflating Mattress Patent Dispute Ends in 63 Days
Zhejiang Natural Outdoor Goods asserted US10018280B2 — a self-inflating camping mattress patent — against rival Chinese outdoor goods importer Hangzhou Loutian in the Northern District of Illinois. The case resolved in just 63 days via a voluntary dismissal with prejudice, with each party bearing its own costs.
A rapid exit: Chinese outdoor goods rivals settle before discovery
On 8 November 2024, Zhejiang Natural Outdoor Goods Inc. filed an infringement action in the U.S. District Court for the Northern District of Illinois against Hangzhou Loutian Import and Export Trade Co., Ltd. (trading as LOUTIAN), asserting patent US10018280B2 in connection with the defendant’s self-inflating camping mattress products. Both parties are China-based outdoor goods manufacturers active in the U.S. import and e-commerce markets.
The case closed on 10 January 2025 — just 63 days after filing — when Zhejiang Natural filed a notice of voluntary dismissal with prejudice under Fed. R. Civ. P. 41(a)(1)(A)(i). Dismissal with prejudice is a permanent resolution: the plaintiff is barred from bringing the same patent claims against this defendant again. The parties agreed each side would bear its own costs and fees, suggesting no damages payment was publicly disclosed.
A resolution of this speed — before any substantive motion practice or discovery — is consistent with either an out-of-court licensing agreement or a commercial settlement that the parties chose to keep confidential. The with-prejudice designation provides finality for Hangzhou Loutian, though the patent itself remains active and enforceable against other parties. What drove the rapid resolution remains unknown from the public record.
Filing to Voluntary dismissal in 63 days
63 days — resolved well before the typical 12–24 month district court patent lifecycle
Voluntarily dismissed with prejudice: what the ruling means for both parties
Rule 41(a)(1)(A)(i): plaintiff’s unilateral right to exit
Under Fed. R. Civ. P. 41(a)(1)(A)(i), a plaintiff may voluntarily dismiss a case without a court order before the defendant has served an answer or a motion for summary judgment. Here, the dismissal is expressly stated to be with prejudice — a higher-finality choice that typically signals the parties have reached a commercial resolution, since the plaintiff is permanently surrendering its right to reassert these claims against this defendant.
Fed. R. Civ. P. 41(a)(1)(A)(i)With prejudice bars any future refiling on the same claims
A dismissal with prejudice operates as a final adjudication on the merits for claim-preclusion purposes. Zhejiang Natural cannot refile US10018280B2 infringement claims against Hangzhou Loutian in any U.S. court. This is a meaningful distinction from a without-prejudice dismissal, which would preserve the option to refile. The public record is silent on whether a licensing fee or other commercial term underpins this finality.
Claim preclusion appliesLoutian exits with full preclusion protection and no cost order
Hangzhou Loutian (LOUTIAN) obtains a durable shield: the with-prejudice dismissal means it faces no further U.S. litigation from Zhejiang Natural on this patent. The own-costs arrangement means Loutian incurs no fee-shifting liability. However, the underlying patent US10018280B2 remains enforceable — if Loutian continues selling competing products, it may face claims based on different legal theories or future patent filings by the same plaintiff.
Patent still live vs. third partiesPatent stays enforceable — and the outdoor mattress market stays contested
The swift resolution leaves US10018280B2 intact and fully enforceable. Zhejiang Natural retains the right to assert the same patent against other self-inflating camping mattress importers and retailers active in the U.S. market. For competitors and Amazon marketplace sellers in the outdoor sleeping category, this case is a signal that the patent owner is actively monitoring the competitive landscape — and willing to litigate quickly.
Enforcement risk remainsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Zhejiang Natural Outdoor Goods Inc. | Company | Chinese outdoor goods manufacturer — holder of US10018280B2 (self-inflating camping mattress)Search in Eureka ↗ |
| Defendant | Hangzhou Loutian Import and Export Trade Co., Ltd. | Company | Hangzhou Loutian Import & Export Trade Co. — Chinese outdoor goods importer, trading as LOUTIANSearch in Eureka ↗ |
| Plaintiff counsel | Tao Liu | Attorney | Counsel for Zhejiang Natural Outdoor Goods Inc.Search in Eureka ↗ |
| Plaintiff counsel | Wei Wang | Attorney | Counsel for Zhejiang Natural Outdoor Goods Inc.Search in Eureka ↗ |
| Plaintiff law firm | Glacier Law LLP | Law Firm | Representing Zhejiang Natural Outdoor Goods Inc.Search in Eureka ↗ |
| Defendant counsel | Shaoyi Che | Attorney | Counsel for Hangzhou Loutian Import and Export Trade Co., Ltd.Search in Eureka ↗ |
| Defendant law firm | Yz Law Firm Llp | Law Firm | Representing Hangzhou Loutian Import and Export Trade Co., Ltd.Search in Eureka ↗ |
| Presiding judge | Judge Sara L. Ellis | Judge | Illinois Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes Rule 41(a)(1)(A)(i) — a unilateral plaintiff mechanism available before any responsive pleading — and expressly designates the dismissal as with prejudice. This phrasing carries significant legal weight: it converts a procedural exit into a merits-equivalent bar, preventing any future refiling of the same infringement claims against Hangzhou Loutian. The own-costs term, while standard in negotiated dismissals, reinforces that no court-imposed liability finding was made.
US10018280B2 — Self-Inflating Camping Mattress Valve and Inflation System
US10018280B2 (application no. US15/161644) protects a self-inflating camping mattress — a product category where the key technical differentiators lie in the valve mechanism controlling air intake and retention, and the open-cell foam structure that drives passive inflation. The patent’s claims likely address the interaction between the valve assembly and foam core that enables the mattress to inflate automatically when unrolled and seal reliably under load, which are the primary engineering challenges in this product class.
In the competitive outdoor gear import market — particularly on Amazon and other U.S. e-commerce platforms — self-inflating mattress designs are widely imitated. A valid patent covering valve and inflation mechanics gives its holder meaningful leverage over competing Chinese manufacturers who rely on similar engineering approaches. The fact that Zhejiang Natural filed suit in a U.S. federal court against a Chinese competitor signals a mature enforcement strategy targeting the U.S. distribution channel rather than manufacturing origin.
Should you run an FTO against US10018280B2?
Any company importing, distributing, or selling self-inflating camping mattresses in the U.S. market — especially through Amazon, REI, or other e-commerce channels — should assess exposure to US10018280B2. The rapid, with-prejudice resolution of this case signals that the patent owner is enforcement-active. R&D and product teams developing next-generation sleeping pad designs with automatic inflation valves should prioritise FTO clearance before U.S. market launch.
PatSnap Eureka’s FTO Search Agent can map the independent claims of US10018280B2 against your product’s valve assembly and foam-core specifications, identify prior art that may narrow the claims, and surface any continuation or divisional applications that could extend the patent family’s reach. Running a targeted FTO now is significantly cheaper than a defence after a complaint is filed.
Run a freedom-to-operate analysis on US10018280B2 to assess your product’s exposure
Run FTO in Eureka →Similar patent disputes: outdoor gear and self-inflating product technology
Explore related infringement actions in the outdoor camping equipment sector filed in the Northern District of Illinois and comparable U.S. district courts.
What this case signals for the outdoor goods IP landscape
A 63-day lifecycle and with-prejudice exit suggest a calculated commercial play — not a routine filing.
Speed-to-resolution suggests a pre-litigation settlement channel
Cases dismissed with prejudice this quickly — before any answer is filed — typically indicate the complaint itself functioned as leverage. The filing likely prompted rapid commercial negotiations. IP teams in the outdoor goods import sector should treat any demand letter from Zhejiang Natural as the opening move of a fast-moving enforcement strategy.
Own-costs terms signal neither party claimed a decisive win
If one party had clearly prevailed on merits, fee-shifting motions under 35 U.S.C. § 285 or Rule 11 would typically follow. The mutual own-costs outcome is more consistent with a negotiated exit than a capitulation, suggesting some form of commercial accommodation — likely undisclosed — was reached between the two Chinese outdoor goods manufacturers.
Zhejiang v Hangzhou — key questions answered
The with-prejudice dismissal means Zhejiang Natural Outdoor Goods has permanently surrendered its right to sue Hangzhou Loutian again on the same US10018280B2 infringement claims. It operates as a final adjudication on the merits for claim-preclusion purposes, even though no court ruling on validity or infringement was issued.
Yes. The dismissal only resolves claims between Zhejiang Natural and Hangzhou Loutian. US10018280B2 remains active and enforceable against all other parties. The patent owner retains full rights to assert the patent against other self-inflating mattress competitors in the U.S. market.
The Northern District of Illinois (Chicago) is an established venue for patent infringement actions, including those involving Chinese-origin products sold in the U.S. market. Plaintiffs may establish venue based on where infringing products are sold or where the defendant conducts business. The court is also known for commercial sophistication and predictable scheduling.
A 63-day resolution — before any answer, discovery, or substantive motion — is well below the typical 12–24 month district court patent lifecycle. This speed is consistent with the complaint functioning as litigation leverage to prompt rapid commercial negotiations, likely resulting in an undisclosed licensing or settlement agreement that was not reflected in the public record.
Not necessarily. The own-costs term means neither party was ordered by the court to pay the other’s attorneys’ fees or litigation costs. However, it does not preclude a private licensing fee or commercial settlement payment agreed between the parties outside the court record. The public docket is silent on any financial terms beyond the costs arrangement.
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