Jinhaigu v. Beijing Choice Electronic: Pulse Oximeter IP Dispute Dismissed
Jinhaigu International Trading (d/b/a Alecaremed) filed a patent infringement action against Beijing Choice Electronic Technology over fingertip pulse oximeter technology in the Northern District of Texas. After 175 days — and before the defendant filed any responsive pleading — the plaintiff voluntarily dismissed the case without prejudice under Rule 41(a)(1)(A)(i).
Alecaremed’s pulse oximeter suit exits quietly — but the door stays open
On 4 December 2024, Jinhaigu International Trading Co. Ltd., operating under the brand name Alecaremed, filed a patent infringement complaint against Beijing Choice Electronic Technology Co. Ltd. in the U.S. District Court for the Northern District of Texas before Judge Ada Brown. The suit centred on US8639308B2 and alleged that Beijing Choice’s fingertip pulse oximeter products infringed Alecaremed’s intellectual property. The accused products were identified by specific Amazon ASINs, suggesting the dispute arose in the context of competitive e-commerce sales of medical-grade SpO2 monitoring devices.
The case closed on 28 May 2025 when Jinhaigu filed a notice of voluntary dismissal without prejudice pursuant to Fed. R. Civ. P. 41(a)(1)(A)(i). Crucially, Beijing Choice had not yet filed an answer or motion for summary judgment at that point, meaning the plaintiff was entitled to dismiss as of right — no court order was required. No defendant agents or law firms are recorded in the public docket, which is consistent with the defendant having not formally appeared.
The 175-day timeline and pre-answer dismissal leave open several commercial explanations: a private settlement, a licensing arrangement, a strategic pause to refile in a different venue, or a decision to pursue IPAB or other enforcement mechanisms. Because the dismissal is without prejudice, Jinhaigu retains the full right to reassert the same claims against Beijing Choice — or other competing pulse oximeter sellers — in a future action. The absence of any public settlement record means the true resolution, if any, cannot be confirmed from the case file alone.
Filing to Voluntary dismissal in 175 days
175-day case duration — shorter than the median district court patent case lifespan
Voluntarily dismissed: what the Rule 41 exit means for both parties
Rule 41(a)(1)(A)(i): dismissal as of right, no court order needed
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 defendant serves an answer or motion for summary judgment. Because Beijing Choice had not filed either, Jinhaigu could exit the case unilaterally. This is the most procedurally simple form of dismissal available in U.S. federal litigation — it requires only the filing of a notice.
Pre-answer voluntary dismissalWithout prejudice: the distinction matters enormously
A dismissal without prejudice preserves the plaintiff’s right to refile the same claims in the future; a dismissal with prejudice would extinguish those rights permanently. The public record here confirms this is a without-prejudice dismissal. However, the underlying reason — whether settlement, licensing, strategic repositioning, or simply a change in litigation approach — is not disclosed. Practitioners should not assume any monetary or licensing terms were or were not agreed upon.
Right to refile preservedBeijing Choice exits without any merits finding against it
Because the dismissal is without prejudice and no merits were adjudicated, Beijing Choice receives no formal vindication — there is no finding of non-infringement or invalidity. The company faces continued exposure if Jinhaigu refiles. The absence of any recorded defendant counsel suggests the company may not have formally engaged U.S. litigation counsel before the dismissal was filed, which is notable for cross-border IP enforcement strategy.
No merits adjudicationAmazon ASIN-level targeting signals a broader e-commerce IP strategy
The complaint identified accused products by Amazon ASINs — a litigation pattern increasingly common in disputes over Chinese-manufactured consumer medical devices sold on U.S. e-commerce platforms. This approach allows plaintiffs to request marketplace takedowns alongside or instead of prolonged litigation. The without-prejudice exit leaves open the possibility that Jinhaigu may pursue parallel enforcement through Amazon’s brand registry or similar mechanisms rather than — or in addition to — future court proceedings.
E-commerce enforcement patternFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Jinhaigu International Trading Co Ltd | Company | Medical device brand (Alecaremed) — holder of US8639308B2, pulse oximeter technologySearch in Eureka ↗ |
| Defendant | Beijing Choice Electronic Technology Co Ltd | Company | Beijing Choice Electronic Technology Co. Ltd. — pulse oximeter manufacturer and sellerSearch in Eureka ↗ |
| Plaintiff counsel | Nicholas E. Najera | Attorney | Counsel for Jinhaigu International Trading Co LtdSearch in Eureka ↗ |
| Plaintiff counsel | Timothy Tiewei Wang | Attorney | Counsel for Jinhaigu International Trading Co LtdSearch in Eureka ↗ |
| Plaintiff law firm | Ni, Wang & Massand PLLC | Law Firm | Representing Jinhaigu International Trading Co LtdSearch in Eureka ↗ |
| Presiding judge | Judge Ada Brown | Judge | Texas Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The dismissal notice invokes Rule 41(a)(1)(A)(i) and expressly states the action is dismissed without prejudice, with the key qualifier that the defendant had not yet filed an answer or motion for summary judgment. This phrasing is legally significant: it confirms the plaintiff’s unilateral right to dismiss and forecloses any argument that court approval was required. No merits finding — on infringement, validity, or damages — was made at any stage of the proceeding. The without-prejudice designation means all claims survive for potential future assertion.
US8639308B2 — Fingertip Pulse Oximeter Monitoring Technology
US8639308B2 (application number US13/409773) covers fingertip pulse oximeter technology — non-invasive medical devices that measure blood oxygen saturation (SpO2) and pulse rate via photoplethysmography. The patent was asserted against products sold under Alecaremed’s own brand and against competing products identified by specific Amazon ASINs, suggesting the protected innovation relates to core device functionality or design elements that are broadly present across the fingertip oximeter product category.
The consumer pulse oximeter market expanded significantly following the COVID-19 pandemic, attracting a large number of Chinese OEM manufacturers selling on U.S. e-commerce platforms. US8639308B2 represents a potential enforcement lever in a crowded, price-competitive segment where design-around opportunities may be limited. For competing brands and Amazon sellers in the medical-grade SpO2 monitoring space, this patent warrants close monitoring — particularly given the without-prejudice dismissal leaves enforcement options fully intact for the patent holder.
Should your team run an FTO against US8639308B2?
Any company manufacturing, importing, distributing, or selling fingertip pulse oximeters in the United States — whether through Amazon, retail, or direct channels — should assess its exposure to US8639308B2. The patent has now been deployed in active litigation, and the without-prejudice dismissal means the plaintiff retains full freedom to refile against Beijing Choice or initiate new actions against other market participants. The ASIN-specific pleading pattern used in this case signals that e-commerce sellers are particularly at risk.
PatSnap Eureka’s FTO Search Agent can map US8639308B2’s claim scope against your product specifications, identify prior art that may support a validity challenge, and surface related patent families held by Jinhaigu or Alecaremed that could broaden enforcement risk. R&D and regulatory teams should run this analysis before launching new pulse oximeter SKUs or expanding their Amazon product portfolio in the U.S. market.
Run a freedom-to-operate analysis on US8639308B2 to assess your product’s exposure
Run FTO in Eureka →Related pulse oximeter and medical device patent cases in U.S. district courts
Cases involving pulse oximeter and consumer medical device patents in U.S. federal courts, with particular focus on Northern District of Texas filings and cross-border enforcement actions.
What this case signals for the pulse oximeter IP enforcement landscape
Pre-answer dismissals in medical device patent cases often obscure commercial resolution. Here is what practitioners and product teams should take away.
Without-prejudice dismissals are not clean endings — monitor for refilings
A Rule 41(a)(1)(A)(i) dismissal without prejudice leaves the plaintiff’s claims legally intact. Any competitor or supply-chain participant selling fingertip pulse oximeters in the U.S. market under overlapping specifications should monitor for a refiled action against Beijing Choice or other similarly situated sellers.
ASIN-level pleading reflects a hybrid enforcement model in consumer medtech
Plaintiffs in this space increasingly plead specific Amazon ASINs to enable parallel enforcement through marketplace mechanisms. R&D and compliance teams at pulse oximeter brands should assess whether their ASIN portfolio could be targeted under the same patent, regardless of how this specific case resolved.
Jinhaigu v Beijing — key questions answered
Jinhaigu International Trading (Alecaremed) filed a patent infringement suit against Beijing Choice Electronic in the Northern District of Texas in December 2024, asserting US8639308B2 over fingertip pulse oximeter products. On 28 May 2025, Jinhaigu voluntarily dismissed the case without prejudice under Rule 41(a)(1)(A)(i), before the defendant filed any answer or motion for summary judgment.
A dismissal without prejudice means Jinhaigu retains the legal right to refile the same infringement claims against Beijing Choice Electronic in the future. No court found that the patent was valid or invalid, infringed or not infringed. The underlying claims under US8639308B2 remain fully intact and could be reasserted at any time within the applicable statute of limitations.
The case asserted US8639308B2 (application number US13/409773), covering fingertip pulse oximeter technology for non-invasive blood oxygen (SpO2) monitoring. The accused products were identified by specific Amazon ASINs associated with Beijing Choice’s fingertip and medical-grade pulse oximeter products.
The public record does not disclose the reason. Common explanations for a pre-answer voluntary dismissal without prejudice include a private settlement or licensing agreement, a decision to refile in a different venue, a strategic pause to gather additional evidence, or a shift to alternative enforcement mechanisms such as Amazon brand registry actions or U.S. Customs exclusion proceedings. No conclusion can be drawn from the available docket.
Under Fed. R. Civ. P. 41(a)(1)(A)(i), a plaintiff may dismiss an action as of right — without needing court approval — before the defendant serves an answer or motion for summary judgment. Because Beijing Choice had not filed either, Jinhaigu could dismiss unilaterally by filing a notice alone. This also means Beijing Choice received no formal merits ruling and retains no res judicata protection against a future refiling of the same claims.
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