Dbest Products v. Wuhan Lanzhi: Portable Cart Patent Dispute Dismissed With Prejudice
Dbest Products Inc. brought a patent infringement action against Wuhan Lanzhi Network Technology Company Ltd. in the Central District of California, asserting two patents covering portable cart technology. The case closed with prejudice after just 99 days, with each party absorbing its own attorneys’ fees — a resolution that forecloses any refiling of the same claims.
A swift dismissal with prejudice on dueling portable cart patents
On 21 May 2025, Dbest Products Inc. filed suit in the U.S. District Court for the Central District of California against Wuhan Lanzhi Network Technology Company Ltd., asserting infringement of US12275446B2 and US12304546B1 — both patents directed to portable cart technology. Dbest, represented by Orbit IP LLP, alleged that Wuhan Lanzhi’s products infringed its intellectual property in what is a competitive and commercially active category of consumer and utility portable storage equipment.
The matter closed on 28 August 2025 — just 99 days after filing — via a court order dismissing the case with prejudice, with each party to bear its own attorneys’ fees and costs. The ‘with prejudice’ designation is legally significant: it extinguishes Dbest’s ability to re-assert these specific claims against Wuhan Lanzhi in any future action, effectively functioning as a final adjudication on the merits for preclusion purposes, even absent a trial verdict.
A resolution within 99 days strongly suggests the parties reached a negotiated agreement shortly after the complaint was filed, though the public record does not disclose any settlement terms. The mutual cost-bearing arrangement is consistent with a negotiated resolution rather than a clear plaintiff or defendant win, as fee-shifting in patent cases typically follows only upon a court finding the case ‘exceptional’ under 35 U.S.C. § 285. What drove the parties to resolve so quickly — whether licensing, design-around, or commercial considerations — remains unknown from the public record.
Filing to Voluntary dismissal in 99 days
99 days — resolved well below the median district court patent case duration of ~2.5 years
Dismissed with prejudice: what the court order means for both parties
Dismissal with prejudice bars any refiling of these claims
A dismissal with prejudice operates as a final judgment on the merits. Dbest Products cannot re-initiate proceedings against Wuhan Lanzhi on the same patent claims — US12275446B2 and US12304546B1 — in any U.S. federal court. This is distinct from a dismissal without prejudice, which would permit refiling. The basis of termination is listed as voluntary dismissal, suggesting the parties agreed to this outcome rather than it being imposed by the court following contested proceedings.
Preclusive effect on both partiesDbest Products gives up the right to refile these specific claims
By accepting a dismissal with prejudice, Dbest Products permanently relinquishes its ability to assert US12275446B2 and US12304546B1 against Wuhan Lanzhi in future litigation. However, the patents themselves remain valid and enforceable against third parties. The mutual cost-bearing clause means Dbest recovered no legal fees, which typically suggests either a modest commercial resolution or a decision that further litigation costs were not commercially justified.
Patents remain enforceable vs. third partiesWuhan Lanzhi secures immunity from these two patents in future U.S. suits
The with-prejudice dismissal provides Wuhan Lanzhi with a permanent shield against re-assertion of these same claims by Dbest Products. No damages or injunction were imposed on the public record. The absence of a defendant law firm in the court record may suggest the matter resolved before Wuhan Lanzhi fully engaged U.S. counsel, though this interpretation is speculative. The cost-neutral outcome means no fee exposure was publicly ordered against either side.
No damages or injunction on recordFast resolution signals active IP enforcement in the portable cart market
The 99-day lifecycle of this case is consistent with the broader pattern of U.S. patent holders using newly-issued patents to quickly signal IP boundaries to Chinese e-commerce competitors — particularly those selling through Amazon and similar platforms. The swift resolution, without a trial or inter partes review, suggests the commercial stakes were managed through negotiation. Competitors in the portable cart and utility trolley space should monitor Dbest’s patent portfolio for continued enforcement activity.
Rapid enforcement cycle in consumer goodsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Dbest Products Inc. | Company | Consumer and utility product IP holder — holder of US12275446B2 and US12304546B1Search in Eureka ↗ |
| Defendant | Wuhan Lanzhi Network Technology Company Ltd. | Company | Chinese consumer goods technology company accused of portable cart patent infringementSearch in Eureka ↗ |
| Plaintiff counsel | Bruce G. Chapman | Attorney | Counsel for Dbest Products Inc.Search in Eureka ↗ |
| Plaintiff counsel | David A. Randall | Attorney | Counsel for Dbest Products Inc.Search in Eureka ↗ |
| Plaintiff counsel | Ehab M. Samuel | Attorney | Counsel for Dbest Products Inc.Search in Eureka ↗ |
| Plaintiff law firm | Orbit IP LLP | Law Firm | Representing Dbest Products Inc.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | California Central District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order uses unambiguous language: the matter is dismissed with prejudice, with each party bearing its own fees. The ‘with prejudice’ designation carries the same preclusive weight as a final merits judgment, barring Dbest from reasserting these claims against Wuhan Lanzhi. The mutual cost provision — rather than a fee award under 35 U.S.C. § 285 — is consistent with a negotiated voluntary resolution rather than a contested ruling. No liability findings, claim constructions, or validity determinations are disclosed in the public record.
US12275446B2 & US12304546B1 — portable cart technology patents
US12275446B2 and US12304546B1 are both U.S. utility patents held by Dbest Products Inc. covering portable cart technology — a product category encompassing folding trolleys, utility carts, and portable storage solutions widely sold through e-commerce channels. Both patents carry corrected application numbers (US18/460131 and US19/032431 respectively), suggesting relatively recent prosecution histories. The portable cart space involves mechanical design, folding mechanisms, load-bearing structures, and ergonomic features that are the subject of active patent prosecution.
For competitors and importers in the portable cart segment, Dbest’s willingness to assert both patents simultaneously against a single defendant signals an aggressive, portfolio-based enforcement posture. The commercial significance of portable carts — particularly in U.S. e-commerce and retail channels where Chinese manufacturers hold significant market share — makes these patents strategically important. Any manufacturer, importer, or distributor of portable carts, folding trolleys, or similar utility products selling into the U.S. market should treat both patents as active enforcement risks.
Should you run an FTO against US12275446B2 and US12304546B1?
Any company designing, importing, or distributing portable carts or folding utility trolleys for the U.S. market should treat both Dbest patents as live FTO risks. This case demonstrates Dbest’s readiness to file suit promptly after patent issuance — and to assert multiple patents simultaneously. The product category is broad enough that structural, folding mechanism, or ergonomic design similarities could trigger infringement analysis, particularly for products sold on Amazon, Walmart.com, or similar platforms.
PatSnap Eureka’s FTO Search Agent can map both US12275446B2 and US12304546B1 claim scopes against your product specifications, surface design-around strategies, and flag prior art that may support validity challenges. Given the recent issuance dates suggested by the application numbers, prosecution history estoppel and claim differentiation analysis are particularly relevant. Eureka can also monitor Dbest’s broader portfolio for newly-issued patents in the portable cart category before they are asserted.
Run a freedom-to-operate analysis on US12275446B2 to assess your product’s exposure
Run FTO in Eureka →Similar portable cart and consumer goods patent cases in C.D. Cal.
Cases involving portable cart and consumer goods patents litigated in the Central District of California, including U.S. enforcement actions against Chinese e-commerce manufacturers.
What this case signals for the portable cart and consumer goods IP landscape
A 99-day with-prejudice dismissal in C.D. Cal. is a recognisable pattern in assertive U.S. IP enforcement against Chinese e-commerce manufacturers.
Newly-issued patents can generate rapid commercial leverage without trial
Both US12275446B2 and US12304546B1 appear to be recently issued patents. Filing suit promptly after issuance — and resolving within 99 days — is consistent with a strategy of using litigation as a licensing or market-exclusion tool rather than pursuing lengthy damages proceedings. R&D and product teams should track newly-issued patents in the portable storage and cart space.
With-prejudice voluntary dismissals often obscure confidential commercial resolutions
The combination of voluntary dismissal, with-prejudice designation, and mutual cost-bearing strongly suggests a negotiated resolution whose terms are not public. This is a common closing mechanism when parties reach a licensing agreement or design-around arrangement. The public record reveals no financial terms, injunctive relief, or admissions — meaning third parties cannot infer the precise commercial outcome.
Dbest v Wuhan — key questions answered
A dismissal with prejudice in case 2:25-cv-04617 means Dbest Products cannot refile the same patent infringement claims — under US12275446B2 or US12304546B1 — against Wuhan Lanzhi in any U.S. court. The order has the same preclusive effect as a final judgment on the merits. The patents themselves remain valid and enforceable against other parties.
Dbest Products asserted two U.S. patents: US12275446B2 (application no. US18/460131) and US12304546B1 (application no. US19/032431), both covering portable cart technology. Both patents appear to have been recently issued based on their application numbers, and were asserted simultaneously in a single infringement action filed in the Central District of California.
The court order specified that each party bear its own attorneys’ fees and costs. This is consistent with a negotiated voluntary dismissal rather than a contested outcome. Under 35 U.S.C. § 285, fee-shifting in patent cases requires a court finding the case ‘exceptional’ — an unlikely outcome in a voluntary settlement. The mutual cost-bearing clause suggests the parties reached a commercial resolution and agreed on cost allocation as part of that arrangement.
The case was resolved in 99 days — from filing on 21 May 2025 to closure on 28 August 2025. This is significantly faster than the median U.S. patent case, which typically takes 2–3 years to trial. A 99-day lifecycle strongly suggests the parties negotiated a resolution shortly after filing, consistent with a licensing agreement, design-around arrangement, or market exit — though no terms are disclosed in the public record.
No. A voluntary dismissal with prejudice does not affect the validity or enforceability of the asserted patents against third parties. US12275446B2 and US12304546B1 remain in force and can be asserted against other manufacturers, importers, or distributors of portable carts. Only Wuhan Lanzhi benefits from the preclusion created by the with-prejudice dismissal in this specific action.
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