Dongguan Aoxun v. Guangdong Willing: Voluntary Dismissal in Heating Pad Patent Case
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📋 Case Summary
| Case Name | Dongguan Aoxun Plastic Products Co., Ltd. v. Guangdong Willing Technology Corporation |
| Case Number | 2:25-cv-02119 (W.D. Wash.) |
| Court | U.S. District Court for the Western District of Washington |
| Duration | Oct 2025 – Jan 2026 87 days |
| Outcome | Voluntary Dismissal (Without Prejudice) |
| Patents at Issue | |
| Accused Products | MI GAO’s ASIN B0DRHWT27P (warming mat sold through Amazon’s U.S. storefront) |
Case Overview
The Parties
⚖️ Plaintiff
Chinese manufacturer based in Dongguan, Guangdong Province, operating in the consumer products and flexible heating device space. The plaintiff holds U.S. patent rights in warming mat and flexible heating pad technology, signaling an active IP assertion posture in the North American marketplace.
🛡️ Defendant
Chinese entity accused of commercializing an infringing product through Amazon’s U.S. marketplace — a common enforcement target in cross-border e-commerce IP disputes involving Chinese manufacturers selling directly to U.S. consumers.
The Patent at Issue
This case involved **U.S. Patent No. 12,349,244 B2 (Application No. US18/939,571)**, covering flexible heating pad and warming mat technology — consumer thermal comfort products. These rights represent meaningful differentiation tools in a competitive consumer goods segment.
- • US12,349,244 B2 — Flexible heating pad and warming mat technology
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The Verdict & Legal Analysis
Outcome
The case was **dismissed without prejudice** by the plaintiff pursuant to **Federal Rule of Civil Procedure 41(a)(1)(A)(i)**. No damages were awarded, no injunctive relief was granted, and no merits determination — including infringement, validity, or claim construction — was reached by the court. Because the dismissal was ‘without prejudice,’ the plaintiff retains the full legal right to refile the same infringement claims against Guangdong Willing Technology at a future date, subject to applicable statutes of limitations.
Key Legal Issues
The formal verdict cause is classified as an **Infringement Action**, meaning the case was initiated as a substantive patent infringement claim under 35 U.S.C. § 271. However, the dismissal before any responsive pleading forecloses any analysis of: claim construction of US12,349,244 B2, literal infringement or doctrine of equivalents arguments, invalidity defenses (obviousness, anticipation, enablement), damages quantification or reasonable royalty analysis. The defendant’s complete silence — no counsel retained, no answer filed — raises several interpretive possibilities: default risk acceptance, a negotiated off-record resolution, product removal from Amazon, or an inability to secure U.S. legal representation within the response window. While no precedent was established, the case illustrates a growing and legally significant phenomenon: **Chinese IP holders asserting U.S. patents against other Chinese manufacturers competing in U.S. e-commerce markets.** This represents a maturation of Chinese entities’ IP enforcement strategies, moving beyond purely defensive postures toward active U.S. patent assertion. The use of Rule 41(a)(1)(A)(i) — specifically timed before any defendant response — is tactically significant. It preserved the plaintiff’s ability to refile while avoiding any risk of an adverse claim construction ruling or an invalidity counterclaim ripening into a binding determination.
Freedom to Operate (FTO) Analysis
This case highlights critical IP risks in flexible heating pad design. Choose your next step:
📋 Understand This Case’s Impact
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High Risk Area
Flexible heating pad and warming mat designs
Relevant Patents
In flexible heating pad technology
Design-Around Options
Available for most claims
✅ Key Takeaways
Rule 41(a)(1)(A)(i) dismissals are a low-cost exit preserving all future enforcement rights, particularly valuable when a defendant’s non-response may signal product removal or off-record settlement.
Search related case law →Monitor cross-border Chinese manufacturer patent assertions in U.S. courts, particularly in e-commerce segments like consumer thermal products.
Explore litigation trends →Frequently Asked Questions
The case involved U.S. Patent No. 12,349,244 B2 (Application No. US18/939,571), covering flexible heating pad and warming mat technology.
Plaintiff Dongguan Aoxun filed a voluntary dismissal under Federal Rule of Civil Procedure 41(a)(1)(A)(i) before the defendant answered or moved for summary judgment, preserving the right to refile.
It signals active patent enforcement in the consumer thermal products e-commerce space and highlights the risk for competing manufacturers selling warming mat products on U.S. platforms without FTO clearance.
This trend indicates a maturation of Chinese entities’ IP enforcement strategies, moving beyond defensive postures toward active U.S. patent assertion in competitive e-commerce markets. It underscores the importance for all manufacturers, regardless of origin, to secure U.S. patent rights and conduct FTO analysis for products sold in the U.S.
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References
- United States District Court for the Western District of Washington – Case 2:25-cv-02119
- U.S. Patent and Trademark Office — Patent 12,349,244 B2
- Federal Rule of Civil Procedure 41(a)(1)(A)(i)
- PatSnap — IP Intelligence Solutions for E-commerce
This article is for informational purposes only and does not constitute legal advice. All case information is drawn from publicly available court records. For platform capabilities, visit PatSnap.