Dongguan Zhaorui v. Uriah Products: Trailer Hitch Patent Suit Dismissed With Prejudice in 28 Days
Dongguan Zhaorui Industrial Technology Co., Ltd. filed a patent infringement action against Uriah Products, LLC in the Missouri Western District Court, asserting US10857846B1 covering an adjustable trailer hitch assembly. The plaintiff voluntarily dismissed its own complaint with prejudice just 28 days after filing — one of the fastest self-terminations on record for a patent infringement case.
A 28-day trailer hitch patent suit ends on plaintiff’s own motion
On 11 March 2025, Dongguan Zhaorui Industrial Technology Co., Ltd., a Chinese industrial technology manufacturer, filed a patent infringement complaint against Uriah Products, LLC in the United States District Court for the Western District of Missouri. The action centred on US10857846B1, a patent covering an adjustable trailer hitch assembly, alleging that Uriah Products’ products infringed that protected design or mechanism.
Less than four weeks later, on 8 April 2025, plaintiff’s counsel filed a voluntary notice of dismissal with prejudice under Federal Rule of Civil Procedure 41(a)(1)(A)(i). This mechanism allows a plaintiff to dismiss its own action before the opposing party serves either an answer or a motion for summary judgment, without requiring court approval. Critically, the ‘with prejudice’ designation permanently bars Dongguan Zhaorui from reasserting the same claims against Uriah Products on US10857846B1.
The 28-day case duration is exceptionally brief and suggests the parties likely reached a private resolution — potentially a licence, a covenant not to sue, or a settlement — almost immediately after the complaint was served. No defendant counsel of record appears in the docket, which is consistent with a pre-answer resolution. The precise terms driving the dismissal are not disclosed in the public record, leaving the commercial outcome between the parties opaque.
Filing to Voluntary dismissal in 28 days
28 days — resolved before most defendants even file an answer
Dismissed with prejudice: what a Rule 41 exit means for both parties
Rule 41(a)(1)(A)(i): plaintiff’s unilateral exit, no court order needed
Under FRCP 41(a)(1)(A)(i), a plaintiff may dismiss its complaint as of right before the defendant serves an answer or a summary judgment motion. No judicial approval is required. Here, because no defendant counsel or answer appears on the docket, this right was available and exercised. The dismissal is self-executing upon filing of the notice, making it one of the most efficient procedural exits in US civil litigation.
Voluntary, right-of-exit dismissal‘With prejudice’ permanently closes the door on this specific claim
A dismissal with prejudice operates as a final adjudication on the merits under res judicata principles. Dongguan Zhaorui cannot refile infringement claims based on US10857846B1 against Uriah Products in any US federal court. This is a materially stronger termination than a without-prejudice dismissal, which would leave the threat of refiling open. The with-prejudice designation strongly suggests a negotiated resolution was the underlying driver.
Permanent bar on refilingUriah Products exits without admitting infringement or paying public damages
Uriah Products, LLC faces no public judgment, injunction, or damages award on the record. No defence counsel even appeared, suggesting any engagement occurred off-docket. The with-prejudice dismissal protects Uriah Products from future suit by this plaintiff on this patent, providing meaningful certainty. Whether any private licence, payment, or product change was agreed as part of a settlement is not disclosed in the court record.
No public liability findingPatent remains valid and enforceable against all other market participants
US10857846B1 survives this litigation entirely intact — no invalidity ruling, no claim construction order, and no adverse finding was made. Dongguan Zhaorui retains full enforcement rights against any other manufacturer or seller of adjustable trailer hitch assemblies. Competitors and distributors in the towing accessories space should treat this patent as actively maintained and commercially enforced, not as one weakened by litigation.
Patent fully enforceable vs. third partiesFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Dongguan Zhaorui Industrial Technology Co., Ltd. | Company | Chinese industrial technology manufacturer — holder of US10857846B1Search in Eureka ↗ |
| Defendant | Uriah Products, LLC | Company | Uriah Products, LLC — US-based seller of trailer hitch and towing accessoriesSearch in Eureka ↗ |
| Plaintiff counsel | Joseph Leroy Johnson | Attorney | Counsel for Dongguan Zhaorui Industrial Technology Co., Ltd.Search in Eureka ↗ |
| Plaintiff counsel | Ruoting Men | Attorney | Counsel for Dongguan Zhaorui Industrial Technology Co., Ltd.Search in Eureka ↗ |
| Plaintiff counsel | Tao Liu | Attorney | Counsel for Dongguan Zhaorui Industrial Technology Co., Ltd.Search in Eureka ↗ |
| Plaintiff law firm | Avek IP LLC | Law Firm | Representing Dongguan Zhaorui Industrial Technology Co., Ltd.Search in Eureka ↗ |
| Plaintiff law firm | Glacier Law LLP | Law Firm | Representing Dongguan Zhaorui Industrial Technology Co., Ltd.Search in Eureka ↗ |
| Presiding judge | Judge M. Douglas Harpool | Judge | Missouri Western District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes Rule 41(a)(1)(A)(i) and explicitly designates the dismissal as ‘with prejudice.’ This phrasing is legally significant: it converts what would otherwise be a neutral procedural exit into a permanent bar on relitigation of these claims. The absence of any counterclaims or defendant appearance confirms the plaintiff exercised this right cleanly. The with-prejudice designation distinguishes this from a tactical pause — it is a final resolution of the claims between these two parties.
US10857846B1 — Adjustable Trailer Hitch Assembly
US10857846B1 protects an adjustable trailer hitch assembly — a mechanical coupling device that allows the hitch receiver height or configuration to be varied to accommodate different trailer and vehicle combinations. The patent was filed under application number US15/950586 and granted to Dongguan Zhaorui Industrial Technology Co., Ltd. The technology sits at the intersection of vehicle accessories and precision mechanical engineering, covering the structural and functional innovations that enable adjustability in trailer coupling systems.
In the competitive towing accessories market, where products are frequently manufactured in China and sold through US e-commerce channels, a granted US patent provides meaningful enforcement leverage against domestic distributors. US10857846B1 emerged from this case with no adverse rulings, no claim narrowing, and no validity challenge on record — making it a strengthened commercial asset. Competitors and private-label sellers in the adjustable hitch category should treat this patent as an active enforcement priority for its holder.
Should you run an FTO analysis against US10857846B1?
Any company designing, manufacturing, importing, or distributing adjustable trailer hitch assemblies in the United States should assess its exposure to US10857846B1. This patent survived litigation without any claim construction or validity challenge, suggesting its scope has not been publicly tested or narrowed. Product teams launching new hitch configurations or expanding SKUs in this category face real infringement risk if they have not mapped their designs against the granted claims.
PatSnap Eureka’s FTO Search Agent can map the claims of US10857846B1 against your product specifications, identify prior art that may support a validity challenge, and flag related patents in Dongguan Zhaorui’s portfolio that may pose additional risk. This is especially relevant for e-commerce sellers and OEM suppliers operating in the towing accessories space, where patent enforcement actions are increasingly common and fast-moving.
Run a freedom-to-operate analysis on US10857846B1 to assess your product’s exposure
Run FTO in Eureka →Similar patent infringement cases: adjustable trailer hitch and towing accessories
Cases involving mechanical trailer hitch patents asserted in US district courts, particularly actions by Chinese industrial technology patentees targeting US-based distributors.
What this case signals for the trailer hitch and towing accessories IP landscape
A 28-day lifecycle and with-prejudice exit suggest a calculated enforcement strategy — not an abandoned claim.
Speed of dismissal is a classic signal of pre-suit settlement leverage
Cases dismissed within 30 days of filing, before the defendant even retains counsel of record, frequently reflect demand-letter-stage resolutions. Dongguan Zhaorui’s rapid exit with prejudice suggests the complaint itself was the negotiating instrument, and that Uriah Products made a commercial decision — likely a licence or payment — to resolve the matter quickly and quietly.
US10857846B1 remains a live enforcement threat for the trailer hitch sector
No invalidity challenge was mounted, no claim construction occurred, and the patent exited litigation unscathed. Any company manufacturing or importing adjustable trailer hitch assemblies into the US market should assess their exposure to US10857846B1 now. A freedom-to-operate analysis is warranted before launching or expanding products in this category.
Dongguan v Uriah — key questions answered
Dongguan Zhaorui filed a patent infringement action against Uriah Products, LLC in the Missouri Western District Court on 11 March 2025, asserting US10857846B1 covering an adjustable trailer hitch assembly. The plaintiff voluntarily dismissed the case with prejudice under Rule 41(a)(1)(A)(i) on 8 April 2025 — just 28 days after filing — before any defendant counsel appeared on the docket.
A with-prejudice dismissal permanently bars Dongguan Zhaorui from refiling the same patent infringement claims against Uriah Products based on US10857846B1. It operates as a final adjudication on the merits under res judicata. Unlike a without-prejudice dismissal, there is no option to refile. The public record does not disclose whether a private settlement, licence, or payment accompanied the dismissal.
Yes. US10857846B1 remains fully valid and enforceable against all third parties. The dismissal only bars claims against Uriah Products specifically. No invalidity ruling, claim construction order, or adverse finding was made in this case, so the patent exits litigation with its scope and validity entirely intact. Other competitors in the adjustable trailer hitch market remain exposed to enforcement.
The 28-day duration and absence of any defendant counsel of record are consistent with a pre-answer private resolution — typically a licence agreement, covenant not to sue, or financial settlement reached shortly after the complaint was served. The with-prejudice designation further suggests a negotiated outcome rather than an abandoned claim. The precise terms are not publicly disclosed.
The case was filed in the United States District Court for the Western District of Missouri and assigned to Judge M. Douglas Harpool. The case number is 6:25-cv-03053. The case closed on 8 April 2025 upon filing of the plaintiff’s voluntary notice of dismissal with prejudice.
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