dbest products v. Zhejiang Xinmao: Portable Cart Patents Dismissed Without Prejudice
dbest products, Inc. sued Chinese manufacturer Zhejiang Xinmao Plastie Industry Company over two portable cart patents in the Central District of California. The plaintiff voluntarily dismissed the case without prejudice just 102 days after filing, before the defendant entered any appearance, leaving the door open for re-filing.
Early voluntary exit before defendant appeared: what drove dbest’s retreat
On 21 May 2025, dbest products, Inc., a California-based portable cart maker, filed an infringement action in the Central District of California against Zhejiang Xinmao Plastie Industry Company, Ltd., a Chinese plastics manufacturer. The complaint asserted two recently issued utility patents — US12275446B2 and US12304546B1 — both directed to portable cart technology. The case was assigned docket number 2:25-cv-04606.
The action ended on 31 August 2025, when dbest filed a voluntary dismissal under Fed. R. Civ. P. 41(a)(1)(A)(i) — the provision permitting a plaintiff to dismiss without a court order when the defendant has not yet filed an answer or motion for summary judgment. Critically, the dismissal was expressly stated to be without prejudice, meaning dbest retains the right to assert these same patents in a future action. Each party was ordered to bear its own costs, fees and expenses.
The 102-day lifespan and pre-answer exit may suggest dbest used the filing strategically — potentially to prompt licensing discussions, gather intelligence, or evaluate enforcement feasibility against a Chinese entity. The public record is silent on whether any settlement or licensing arrangement was reached; without prejudice dismissals of this kind frequently accompany out-of-court resolutions, though that cannot be confirmed here. The two asserted patents remain enforceable and available for future assertion.
Filing to Voluntary dismissal in 102 days
102 days — resolved before defendant filed any response
Voluntarily dismissed without prejudice: what the exit terms mean for both parties
Rule 41(a)(1)(A)(i): plaintiff’s right to dismiss before defendant appears
Fed. R. Civ. P. 41(a)(1)(A)(i) allows a plaintiff to voluntarily dismiss an action as of right — without a court order — provided the defendant has not yet filed an answer or a motion for summary judgment. Because Zhejiang Xinmao filed neither, dbest could exit unilaterally. The dismissal takes effect immediately upon filing and does not require judicial approval.
No court order requiredWithout prejudice preserves dbest’s right to refile
A dismissal without prejudice means the underlying claims are not adjudicated on the merits and are not barred by res judicata. dbest expressly invoked this designation, confirming it retains the right to assert US12275446B2 and US12304546B1 against Zhejiang Xinmao — or other defendants — in future proceedings. This contrasts with a dismissal with prejudice, which would permanently extinguish the asserted claims. The public record does not disclose why dbest chose to exit at this stage.
Claims remain liveZhejiang Xinmao exits without liability — but exposure persists
The defendant avoided any finding of infringement, damages, or injunction. Because Zhejiang Xinmao never appeared in the case, no legal costs were incurred in a U.S. court. However, the without-prejudice nature of the dismissal means the threat of re-litigation remains real. If dbest’s underlying patents are commercially significant, Zhejiang Xinmao should treat this outcome as a deferral of risk, not its elimination.
Exposure not eliminatedPre-answer exit signals potential strategic use of U.S. patent enforcement
Filing against a Chinese manufacturer in the Central District of California and dismissing before service or appearance is a pattern consistent with leverage-driven enforcement strategies — using litigation initiation to prompt commercial negotiations. Other portable cart or consumer goods manufacturers importing into the U.S. should note that US12275446B2 and US12304546B1 remain active, enforceable patents. The sector may see follow-on assertions if dbest pursues a broader enforcement programme.
Re-filing risk remainsFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | dbest products, Inc. | Company | Portable cart manufacturer and IP holder of US12275446B2 and US12304546B1Search in Eureka ↗ |
| Defendant | Zhejiang Xinmao Plastie Industry Company, Ltd. | Company | Chinese plastics manufacturer — Zhejiang Xinmao Plastie Industry Company, Ltd.Search 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 dismissal notice expressly confirms two conditions under Rule 41(a)(1)(A)(i): the defendant had not filed an answer or summary judgment motion, and the plaintiff had not previously dismissed a federal or state action on the same claims. The explicit invocation of Rule 41(a)(1)(B) and the without-prejudice designation is legally significant — it means no two-dismissal bar has yet been triggered. dbest retains a single future dismissal of right before any such bar would apply. The cost-bearing provision — each party to bear its own costs — is standard for pre-appearance voluntary dismissals and carries no adverse inference.
US12275446B2 & US12304546B1 — Portable Cart Technology
US12275446B2 and US12304546B1 are both recently issued U.S. utility patents asserted by dbest products in the portable carts space. Both carry relatively recent application numbers (US18/460131 and US19/032431 respectively), suggesting they protect innovations developed during a period of active product development. Portable cart patents typically cover structural configurations, folding mechanisms, load-bearing elements, or material combinations that differentiate one cart design from commodity alternatives.
For a consumer goods company like dbest, these patents represent a front-line competitive moat against lower-cost Chinese imports. The decision to assert both patents simultaneously suggests dbest believes the accused products read on claims across multiple patent families, potentially complicating design-around strategies. Companies active in the portable storage, utility cart, or collapsible goods segments should conduct independent analysis of both patents to assess design-around freedom and FTO clearance.
Should you run an FTO against US12275446B2 and US12304546B1?
Any company designing, manufacturing, importing, or distributing portable carts into the U.S. market should conduct a freedom-to-operate analysis against US12275446B2 and US12304546B1. The without-prejudice dismissal in this case means dbest retains full enforcement rights. Because no claim construction has been issued and no validity challenge has been publicly litigated, the actual scope of both patents remains commercially uncertain — a risk that FTO analysis is specifically designed to quantify.
PatSnap Eureka’s FTO Search Agent allows R&D and legal teams to run structured claim-by-claim comparisons against US12275446B2 and US12304546B1, mapping your product specifications against the asserted claims and identifying prosecution history, prior art, and related family members. For companies sourcing from Chinese manufacturers subject to U.S. patent enforcement, Eureka’s import monitoring and enforcement history tools provide early warning before litigation is filed.
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 the C.D. Cal.
Cases involving portable cart and consumer goods patents litigated in the Central District of California, including enforcement actions against Chinese manufacturers.
What this case signals for the portable carts and consumer goods IP landscape
A fast-cycle voluntary dismissal against a Chinese manufacturer raises questions about enforcement strategy, patent scope, and sector-wide exposure.
Without prejudice dismissal keeps both patents fully enforceable against the market
US12275446B2 and US12304546B1 were not challenged, invalidated, or narrowed in this proceeding. Any manufacturer or importer of portable carts operating in the U.S. market should treat these patents as live enforcement risk. The absence of a merits ruling means no prior art arguments or claim construction positions have been tested publicly.
Pre-answer dismissals often signal off-record resolution or enforcement reassessment
Cases dismissed before the defendant even appears rarely reflect plaintiff weakness alone. The pattern is consistent with licensing discussions, import-channel pressure, or a decision to pursue enforcement through alternative channels such as ITC Section 337 proceedings. Competitors in the portable cart segment should monitor dbest’s broader IP activity closely.
dbest v Zhejiang — key questions answered
dbest products, Inc. filed a patent infringement action against Zhejiang Xinmao Plastie Industry Company in the Central District of California on 21 May 2025, asserting US12275446B2 and US12304546B1 covering portable carts. The plaintiff voluntarily dismissed the case without prejudice on 31 August 2025 — 102 days after filing — before the defendant filed any answer or response.
A dismissal without prejudice means the asserted claims were not decided on the merits and are not barred by res judicata. dbest retains the full right to assert US12275446B2 and US12304546B1 against Zhejiang Xinmao or any other defendant in future proceedings. The patents remain valid, issued, and enforceable.
The public record does not disclose dbest’s reasons. However, pre-answer voluntary dismissals against Chinese manufacturers are consistent with several strategic patterns: out-of-court licensing discussions, enforcement reassessment, a pivot to ITC Section 337 proceedings, or a decision to consolidate claims against multiple defendants. None of these can be confirmed from the available record.
Both patents are utility patents asserted by dbest products in the portable carts technology space, with application numbers US18/460131 and US19/032431 respectively. They appear to cover innovations in portable cart design or construction. Because no claim construction was issued in this case, the precise scope of both patents has not been publicly adjudicated.
Under Fed. R. Civ. P. 41(a)(1)(B), a plaintiff who has not previously dismissed a federal or state court action on the same claims may dismiss once as of right without prejudice. dbest expressly confirmed this was its first dismissal on these claims. If dbest refiles and voluntarily dismisses a second time, that second dismissal would operate as a dismissal with prejudice under the two-dismissal rule — permanently barring the claims.
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