Flag Light Patent Infringement: Default Judgment Win for Linhai Yujing
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📋 Case Summary
| Case Name | Linhai Yujing Electronic Lighting Co. Ltd. v. IRONFORGE LIGHTING et al. |
| Case Number | 1:24-cv-02099 (N.D. Ill.) |
| Court | U.S. District Court for the Northern District of Illinois |
| Duration | Mar 2024 – Aug 2024 169 days |
| Outcome | Plaintiff Win — Default Judgment ($250 Damages + Injunction) |
| Patents at Issue | |
| Accused Products | Flag Light Products (Goods ID: 601099536887128) on TEMU |
Case Overview
The Parties
⚖️ Plaintiff
Chinese manufacturer specializing in electronic lighting products, asserted design patent rights over a specific flag light product configuration.
🛡️ Defendants
Marketplace sellers, including IRONFORGE LIGHTING and kalynmart, operating as “Partnerships and unincorporated Associations Identified in Schedule A.”
The Patent at Issue
This case involved a single design patent covering the ornamental appearance of a flag light product. Design patents under 35 U.S.C. § 171 protect non-functional, aesthetic features of a manufactured article.
- • US D875,973S — Ornamental design of a flag light product
Selling a similar product?
Check if your product’s design might infringe this or related patents before listing.
The Verdict & Legal Analysis
Outcome
Chief Judge Jeremy C. Daniel granted both the request for default and the motion for default judgment in full. Key relief awarded included a permanent injunction prohibiting defendants from dealing in infringing flag light products, platform-level restraint requiring TEMU and other third-party providers to disable marketplace accounts and freeze associated financial accounts, statutory damages of $250.00 USD, asset release, and bond release.
Verdict Cause Analysis
The sole cause of action was patent infringement — specifically, infringement of design patent USD875,973S. Damages were calculated under 35 U.S.C. § 289, the design patent-specific damages statute, which allows a patent holder to recover the total profit an infringer made. The court’s order authorizing supplemental proceedings under Federal Rule of Civil Procedure 69 preserves the plaintiff’s right to pursue additional asset discovery.
Legal Significance
This case reinforces the utility of 35 U.S.C. § 289’s total-profit disgorgement remedy in design patent enforcement, particularly against low-volume marketplace sellers. Even where damages are minimal, the permanent injunction and platform-level takedown orders provide the enforcement outcome that matters most to rights holders: removal of infringing products and account termination. The Schedule A filing structure continues to receive judicial acceptance in the Northern District of Illinois, making it a repeatable and cost-effective enforcement mechanism for design patent holders targeting e-commerce infringement.
Strategic Takeaways
For Patent Holders:
- • Design patents covering consumer product aesthetics are highly enforceable against marketplace sellers through default judgment proceedings when defendants fail to appear.
- • Securing early asset freezes via platform providers (TEMU, Amazon) creates leverage even before a final judgment.
- • The 35 U.S.C. § 289 total-profit remedy, combined with injunctive relief, makes design patent enforcement viable even where per-unit damages are modest.
For Accused Infringers / Marketplace Sellers:
- • Failure to respond to Schedule A complaints results in automatic default — sellers on TEMU and similar platforms should monitor for service of process and legal notices delivered via email or platform notification.
- • Account freezes can precede final judgment, creating immediate business disruption without a trial.
For R&D and Product Development Teams:
- • Freedom-to-operate (FTO) analysis must include design patent clearance, not just utility patent searches, particularly for consumer-facing decorative or novelty lighting products.
- • Products sold on Chinese export platforms targeting U.S. consumers are subject to full U.S. patent enforcement jurisdiction.
Industry & Competitive Implications
This case reflects a well-established but intensifying enforcement strategy: Chinese manufacturers asserting U.S. design patents against competing Chinese sellers operating through global e-commerce platforms.
📋 For Lighting Sector Manufacturers
Design patent portfolios are now active competitive weapons among manufacturers themselves. Proactive IP landscape analysis is crucial before listing new product configurations.
- Proactive IP landscape analysis is crucial.
- Design patents are active competitive weapons.
- Monitor competitor filings and marketplace listings.
🛒 For E-commerce Platform Operators
U.S. courts expect rapid compliance with asset freeze and account takedown orders, reinforcing operational and compliance burdens for platforms like TEMU.
- Rapid compliance with court orders is expected.
- Operational and compliance burden on platforms.
- Robust IP enforcement policies are critical.
Design Patent Enforceable
Against marketplace sellers
169 Days to Judgment
Swift enforcement timeline
Platform Takedown
Orders routinely granted
✅ Key Takeaways
Schedule A + default judgment remains an efficient design patent enforcement pathway in the N.D. Illinois.
Search related case law →35 U.S.C. § 289 total-profit damages apply even at statutory minimum levels, preserving the injunctive relief outcome.
Explore precedents →Federal Rule of Civil Procedure 69 supplemental proceedings extend post-judgment enforcement reach.
Learn more about FRCP 69 →Frequently Asked Questions
U.S. Design Patent USD875,973S (application no. US29/644741), covering the ornamental design of a flag light product.
Defendants IRONFORGE LIGHTING and kalynmart failed to appear, respond to the complaint, or retain counsel, resulting in default under Federal Rule of Civil Procedure 55.
It reinforces the viability of Schedule A enforcement strategies against e-commerce marketplace sellers and highlights that design patent rights are actively enforced among competing manufacturers, not just by domestic companies against foreign sellers.
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References
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.