LKRB Industries v. HPG: Default Judgment & Permanent Injunction Over LED Strip Patent
LKRB Industries, LLC secured a default judgment and permanent injunction against Chinese seller xuzhouaiyaxundianzishangwuyouxiangongsi — operating as HPG — over the sale of encapsulated flexible LED light strips on Amazon and HappyGrandpa.com, asserting US8789988B2. The case resolved in 376 days without the defendant meaningfully contesting the claims.
LED patent holder secures default judgment against Amazon storefront seller
LKRB Industries, LLC filed this patent infringement action on November 22, 2024, in the Western District of Pennsylvania before Judge William S. Stickman. The suit targeted xuzhouaiyaxundianzishangwuyouxiangongsi, a Chinese e-commerce entity operating as HPG, for allegedly infringing US8789988B2 through the sale of encapsulated flexible LED light strips on Amazon.com and at www.HappyGrandpa.com. The patent covers flexible LED strip technology — a product category with significant mass-market presence across online retail channels.
The case terminated on December 3, 2025, on the basis of a default judgment. Because the defendant failed to appear or defend, the court entered a final default judgment and permanent injunction, prohibiting continued infringing sales and retaining jurisdiction to enforce compliance. The court also authorised electronic service of process, reflecting the cross-border nature of the dispute and the practical challenges of serving Chinese defendants through conventional means.
The 376-day duration is consistent with default judgment timelines in cross-border e-commerce patent cases, where defendants often decline to engage with US proceedings. The absence of a defence means no claim construction, invalidity arguments, or damages trial occurred — leaving the scope and value of the patent untested on the merits. What remains unknown from the public record is whether any damages award accompanied the injunction, and whether LKRB has pursued or intends to pursue enforcement actions against the defendant’s Amazon seller account or US-based assets.
Filing to Default Judgment in 376 days
376 days from filing to default judgment — faster than median district court patent case
Default judgment entered: what the ruling means for both parties
Default judgment: liability established without a merits contest
A default judgment is entered when a defendant fails to appear or respond to a complaint. The court accepts the plaintiff’s well-pleaded allegations as true and may grant the requested relief. Here, the court entered both a final default judgment on infringement and a permanent injunction. Critically, no invalidity defence was raised — meaning the patent’s validity was never adjudicated. The court also retained jurisdiction to enforce the order.
No merits adjudicationLKRB wins injunction — but enforcement is the harder battle
LKRB Industries obtained the strongest available civil remedy: a permanent injunction barring the defendant from continued infringing sales. The court’s retention of jurisdiction signals ongoing oversight. However, enforcing a US injunction against a China-based seller requires practical steps — including potential action against Amazon to delist the HPG storefront and attempts to reach US-based assets or bank accounts. The judgment’s commercial value depends heavily on enforcement follow-through.
Permanent injunction grantedDefendant faces injunction and continued court exposure
By failing to appear, the defendant forfeited any opportunity to challenge the patent’s validity, contest infringement, or negotiate a licence. The permanent injunction, if enforced, bars continued US sales of the accused LED strips. The court’s retained jurisdiction means LKRB can return to seek contempt or damages if sales continue. The defendant also remains exposed to a separate damages motion, as default judgments on liability do not automatically quantify monetary relief.
Injunction risk if sales continueAmazon enforcement and e-commerce IP strategy come into focus
This case is consistent with a broader litigation strategy targeting Chinese sellers on US e-commerce platforms using IP rights. A court order of this type can support a Brand Registry or APEX complaint to Amazon, potentially accelerating product delisting without further court action. For other LED lighting sellers operating similar storefronts, the case signals that US patent holders are actively monitoring Amazon listings and willing to pursue default judgment as an enforcement mechanism.
Amazon delisting risk for infringing sellersFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | LKRB INDUSTRIES, LLC | Company | Lighting IP holding company — holder of US8789988B2 covering flexible LED light strip technologySearch in Eureka ↗ |
| Defendant | xuzhouaiyaxundianzishangwuyouxiangongsi | Individual | Chinese e-commerce seller operating HPG brand on Amazon.com and HappyGrandpa.comSearch in Eureka ↗ |
| Plaintiff counsel | John A. Schwab | Attorney | Counsel for LKRB INDUSTRIES, LLCSearch in Eureka ↗ |
| Plaintiff law firm | John A. Schwab, Attorney at Law, LLC | Law Firm | Representing LKRB INDUSTRIES, LLCSearch in Eureka ↗ |
| Defendant counsel | Jianyin Liu | Attorney | Counsel for xuzhouaiyaxundianzishangwuyouxiangongsiSearch in Eureka ↗ |
| Presiding judge | Judge William S. Stickman | Judge | Pennsylvania Western District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order directs LKRB to serve the defendant with the judgment and explicitly retains jurisdiction to ensure compliance and enforcement of both the default judgment and the permanent injunction. This language is standard in default IP cases but operationally significant — it means LKRB can return to court on a motion for contempt if HPG resumes sales. The absence of a stated damages figure in the verdict suggests monetary relief, if any, may be subject to a separate quantum hearing or was not requested in the initial motion.
US8789988B2 — encapsulated flexible LED light strip technology
US8789988B2, filed under application number US13/187588, covers encapsulated flexible LED light strip technology. Flexible LED strips are a high-volume consumer and commercial lighting product sold extensively through online retail channels including Amazon. The encapsulation element — protecting the LED components in a flexible housing — is a key technical differentiator associated with durability and moisture resistance. The patent’s grant date and application lineage suggest it covers technology that became commercially mainstream as LED adoption accelerated.
For the LED lighting sector, this patent represents a potential enforcement risk for any seller offering encapsulated flexible LED strips in the US market, particularly those selling through Amazon storefronts. LKRB’s willingness to pursue litigation — including against small overseas sellers — suggests an active enforcement posture. Competitors, OEM suppliers, and white-label importers of flexible LED products should assess whether their product configurations fall within the claims of US8789988B2, particularly given that a default judgment leaves the claims untested and nominally valid.
Should your LED strip products be cleared against US8789988B2?
Any company manufacturing, importing, or selling encapsulated flexible LED light strips in the US market — including Amazon third-party sellers, lighting distributors, and OEM suppliers — should treat US8789988B2 as an active enforcement risk. LKRB has demonstrated willingness to litigate, and a permanent injunction has already been issued in this matter. Product teams launching or scaling LED strip lines on US e-commerce platforms should commission an FTO analysis before listing.
PatSnap Eureka’s FTO Search Agent allows R&D and legal teams to rapidly map the claims of US8789988B2 against your product specifications, identify design-around opportunities, and surface any post-grant proceedings that may affect the patent’s validity. With LKRB’s patent unchallenged on the merits, an independent validity and freedom-to-operate assessment is the most defensible first step for any potential market entrant in this product category.
Run a freedom-to-operate analysis on US8789988B2 to assess your product’s exposure
Run FTO in Eureka →Similar LED lighting patent infringement cases in US district courts
Cases involving flexible LED and consumer lighting patents litigated in US district courts against e-commerce sellers, including Amazon-channel enforcement actions.
What this case signals for the LED lighting and e-commerce IP landscape
Default judgments against overseas Amazon sellers are becoming a recurring enforcement tool for US patent holders in the consumer electronics and lighting sectors.
Default judgments are a viable — and cost-efficient — IP enforcement tool
Where defendants are overseas e-commerce sellers unlikely to appear in US proceedings, pursuing default judgment avoids the cost of claim construction and trial. LKRB obtained a permanent injunction in 376 days. Rights holders with clear infringement evidence and a clean patent should evaluate this route before committing to full litigation budgets.
A court order strengthens Amazon Brand Registry enforcement
A final default judgment and permanent injunction can be submitted to Amazon’s Brand Registry or APEX programme to support expedited product removal. This effectively converts a court order into a practical delisting tool — giving the judgment commercial teeth even where direct enforcement against a Chinese entity is difficult.
LKRB v xuzhouaiyaxundianzishangwuyouxiangongsi — key questions answered
The Western District of Pennsylvania entered a final default judgment and permanent injunction against the defendant. The defendant failed to appear, so the court accepted LKRB’s infringement allegations and granted injunctive relief barring continued sales of the accused HPG encapsulated flexible LED light strips on Amazon and HappyGrandpa.com.
US8789988B2 covers encapsulated flexible LED light strip technology. In this case, LKRB alleged the defendant’s HPG-branded LED strips sold on Amazon and at HappyGrandpa.com infringed the patent. The patent’s validity was not contested, as no defendant appeared to raise an invalidity defence.
Enforcement against a China-based entity is legally possible but practically complex. The most direct route is submitting the court order to Amazon’s Brand Registry or APEX programme to support product delisting. The court retained jurisdiction to ensure compliance, meaning LKRB may return for contempt proceedings if infringing sales continue through US channels.
No. A default judgment accepts the plaintiff’s allegations as true for purposes of that proceeding but does not constitute a merits adjudication of patent validity. The patent was never subjected to claim construction or invalidity analysis. Any future defendant in a new infringement action could still challenge validity, including through an inter partes review petition at the USPTO.
Electronic service was authorised because the defendant is a China-based e-commerce entity. Conventional service under the Hague Convention on Chinese defendants is often slow or impractical. US courts in e-commerce IP cases have increasingly permitted alternative electronic service — including via email and online seller platform messaging — where traditional methods would be unduly burdensome or ineffective.
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