Shenzhenshijinxindun v. Daka Research: Jar Opener Patent Suit Voluntarily Dismissed
Nine Chinese e-commerce and trading entities filed a patent infringement action against Daka Research Inc. in the Northern District of Texas, asserting US7398714B1 covering jar opener products. After 479 days, all plaintiffs voluntarily dismissed the case without prejudice before Daka filed any responsive pleading.
Nine plaintiffs, one jar opener patent, and a pre-answer exit
On 21 April 2024, Shenzhenshijinxindun Electronic Commerce Co. and eight co-plaintiffs — all Chinese e-commerce or trading entities based in Shenzhen or Dongguan — filed a patent infringement action in the U.S. District Court for the Northern District of Texas (Case No. 3:24-cv-00966) before Judge Brantley Starr. The single patent asserted was US7398714B1, directed to a jar opener product, with the plaintiffs represented by the firm Ni, Wang & Massand PLLC.
The case closed on 13 August 2025 when all plaintiffs filed a voluntary notice of dismissal under Fed. R. Civ. P. 41(a)(1)(A)(i), dismissing the action without prejudice as to both named defendants — Daka Research Inc. and Shenzhen Baichenan Trading Co., Ltd. The notice expressly confirmed that neither defendant had yet filed an answer or a motion for summary judgment at the time of filing, satisfying the procedural precondition for a unilateral voluntary dismissal.
A 479-day case duration before a pre-answer dismissal is notably extended, suggesting the parties may have engaged in settlement negotiations or that case management complexities with nine co-plaintiffs contributed to the timeline. Because the dismissal is without prejudice, the plaintiffs retain the right to refile the same claims, though a second voluntary dismissal against the same defendant would operate as an adjudication on the merits under Rule 41 — a significant strategic constraint the public record leaves unaddressed.
Filing to Voluntary dismissal in 479 days
479 days — longer than the median voluntary dismissal in N.D. Texas patent cases
Voluntarily dismissed: what the Rule 41 exit means for both parties
Rule 41(a)(1)(A)(i): unilateral right to dismiss before answer
Fed. R. Civ. P. 41(a)(1)(A)(i) allows a plaintiff to dismiss an action without a court order at any time before the opposing party serves an answer or a motion for summary judgment. Because Daka Research had not yet done either, the plaintiffs could — and did — exit unilaterally. No judicial approval was required, and the court had no discretion to deny the dismissal.
Pre-answer voluntary exitWithout prejudice confirmed — but refiling risk is real
The dismissal notice explicitly states ‘WITHOUT PREJUDICE,’ meaning no judgment was entered and the plaintiffs are not barred from reasserting US7398714B1 against these defendants. However, under the ‘two-dismissal rule’ of Rule 41(a)(1)(B), a second voluntary dismissal of the same claim against the same defendant would automatically constitute an adjudication on the merits — a critical constraint if litigation is contemplated again.
Claims preserved; two-dismissal rule appliesDaka Research exits without admitting liability or incurring a judgment
Daka Research Inc. faces no judgment, injunction, or damages award from this action. Because the dismissal is without prejudice, the threat of future litigation on US7398714B1 is not entirely extinguished. Daka may nonetheless treat the dismissal as a practical signal that plaintiffs assessed the case as unlikely to succeed or not worth pursuing — though the public record does not confirm any settlement or licence.
No liability; future claim risk remainsJar opener IP enforcement: pattern litigation with multiple plaintiffs
The involvement of nine Chinese e-commerce co-plaintiffs in a single U.S. district court action is consistent with coordinated IP enforcement strategies increasingly used by Chinese consumer-product sellers to police copycat listings. For other jar opener distributors and online retailers, the without-prejudice dismissal suggests US7398714B1 remains a live enforcement risk, and any seller of competing products should consider whether their supply chain could be targeted in a refiled action.
Live patent; future enforcement possibleFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Shenzhenshijinxindundianzishangwuyouxiangongsi | Individual | Chinese e-commerce and trading entities — holders of US7398714B1 (jar opener)Search in Eureka ↗ |
| Co-Plaintiff | Dongguanshibaxuandianzishangwuyouxiangongsi | Individual | Search in Eureka ↗ |
| Co-Plaintiff | Dongguanshichaweidianzishangwuyouxiangongsi | Individual | Search in Eureka ↗ |
| Co-Plaintiff | Dongguanshiedengshuangmaoyiyouxiangongsi | Individual | Search in Eureka ↗ |
| Co-Plaintiff | dongguanshinuoxiangmaoyiyouxiangongsi | Individual | Search in Eureka ↗ |
| Co-Plaintiff | lan shan qu zhao yuan bai huo dian | Individual | Search in Eureka ↗ |
| Co-Plaintiff | Shenzhenshibaishengyiwangluokejiyouxiangongsi | Individual | Search in Eureka ↗ |
| Co-Plaintiff | Shenzhenshixinyufankejiyouxiangongsi | Individual | Search in Eureka ↗ |
| Co-Plaintiff | Yuanzhouquqishabaihuodian | Individual | Search in Eureka ↗ |
| Defendant | Daka Research Inc | Company | Daka Research Inc. — product research and distribution company named in jar opener infringement suitSearch in Eureka ↗ |
| Plaintiff counsel | Hao Ni, Esq. | Attorney | Counsel for ShenzhenshijinxindundianzishangwuyouxiangongsiSearch in Eureka ↗ |
| Plaintiff law firm | Ni, Wang & Massand PLLC | Law Firm | Representing ShenzhenshijinxindundianzishangwuyouxiangongsiSearch in Eureka ↗ |
| Presiding judge | Judge Brantley Starr | Judge | Texas Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes Rule 41(a)(1)(A)(i) precisely, confirming this was a unilateral plaintiff action requiring no court order. The explicit ‘WITHOUT PREJUDICE’ language and the confirmation that defendants had not yet answered are legally significant: they establish that the two-dismissal rule has been triggered once, and that no estoppel or res judicata attaches to US7398714B1 claims against Daka Research or Baichenan. The phrasing leaves open whether any commercial arrangement was reached off the record.
US7398714B1 — Mechanical jar opener device patent
US7398714B1 is a U.S. utility patent (application number US11/752256) covering a jar opener product in the consumer kitchen goods category. The patent issued as a grant with the B1 designation, indicating it issued without prior publication. It sits in the mechanical consumer products space — a technically mature but commercially active domain where design differentiation and IP enforcement around specific opening mechanisms remain relevant for e-commerce sellers.
For Chinese e-commerce entities selling into the U.S. market, holding a granted U.S. patent on a consumer product creates a direct enforcement lever against competing online listings. The fact that nine co-plaintiffs collectively asserted this single patent suggests it may sit at the centre of a broader brand or product protection strategy. Any competitor, retailer, or Amazon marketplace seller distributing jar opener products in the U.S. should assess whether their product design falls within the claims of US7398714B1 — particularly given the without-prejudice dismissal leaves enforcement options open.
Should you run an FTO against US7398714B1 for jar opener products?
If your company imports, distributes, or retails jar opener products in the United States — including through online marketplaces — US7398714B1 represents a live freedom-to-operate concern. The voluntary without-prejudice dismissal in this case does not invalidate or limit the patent’s claims. Any product that operates via a similar mechanical jar-opening mechanism should be assessed against the issued claims before market entry or continued sale.
PatSnap Eureka’s FTO Search Agent allows R&D and product teams to map jar opener product designs against the claim scope of US7398714B1, identify prior art that could support invalidity arguments, and flag related patents in the same family or owned by the same plaintiff group. Given the coordinated multi-plaintiff enforcement pattern visible in this case, a comprehensive FTO review covering related Chinese-origin consumer product patents is advisable for any U.S. market participant in this category.
Run a freedom-to-operate analysis on US7398714B1 to assess your product’s exposure
Run FTO in Eureka →Similar consumer product patent cases in the Northern District of Texas
Explore comparable mechanical consumer product infringement actions filed by Chinese e-commerce plaintiffs in the Northern District of Texas, including related Rule 41 voluntary dismissals.
What this case signals for consumer product IP enforcement in U.S. courts
Coordinated Chinese plaintiff groups are using U.S. district courts to enforce consumer product patents — and without-prejudice exits preserve maximum optionality.
Pre-answer dismissal preserves plaintiffs’ full optionality on US7398714B1
By dismissing before Daka filed any responsive pleading, the plaintiffs incurred no adverse ruling and reset the litigation clock. US7398714B1 remains fully enforceable. Any party in the jar opener supply chain — importers, distributors, or online marketplace sellers — should treat this patent as an active enforcement asset, not a resolved threat.
Multi-plaintiff structures in consumer product cases signal coordinated strategy
Nine co-plaintiffs across Shenzhen and Dongguan acting together suggests a coordinated enforcement or brand-protection programme. Companies facing similar structures should assess whether the plaintiffs hold related IP assets or are licensing US7398714B1 to a broader portfolio — both scenarios elevate exposure risk beyond a single-defendant dispute.
Shenzhenshijinxindundianzishangwuyouxiangongsi v Daka — key questions answered
The dismissal without prejudice means no judgment was entered and US7398714B1 claims against Daka Research and Baichenan were not adjudicated on the merits. The plaintiffs retain the right to refile the same patent claims against the same defendants, though a second voluntary dismissal would operate as an adjudication on the merits under Rule 41(a)(1)(B).
US7398714B1 is a granted U.S. utility patent (application no. US11/752256) covering a jar opener device in the mechanical consumer products category. The B1 suffix indicates the patent issued without prior publication. It was the sole patent asserted in this infringement action against Daka Research Inc. in the Northern District of Texas.
The public record does not explain the 479-day duration before a pre-answer voluntary dismissal. Possible explanations include settlement or licensing negotiations between the parties, procedural complexity arising from nine co-plaintiffs and two defendants, or strategic monitoring of Daka’s product activities. No settlement terms are publicly disclosed.
Yes. Because the dismissal was without prejudice, the plaintiffs are not barred from refiling the same claims against Daka Research. However, if the plaintiffs voluntarily dismiss a second action against the same defendant on the same claims, Rule 41(a)(1)(B) would treat that second dismissal as an adjudication on the merits — potentially barring further litigation on those claims.
The involvement of nine Chinese e-commerce and trading entities as co-plaintiffs is consistent with coordinated IP enforcement strategies used by Chinese consumer product sellers to protect U.S. market positions. It suggests a shared commercial interest in the jar opener product covered by US7398714B1, potentially through a common ownership structure, licensing arrangement, or joint enforcement programme. The structure also distributes litigation costs and complexity across multiple parties.
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