Zhang v. Schedule A Defendants: Ladder Stabilizer Design Patent Case Dismissed
Jianqun Zhang filed suit in the Northern District of Illinois asserting design patent USD1080919S covering a ladder stabilizer against a class of anonymous online defendants. The case was dismissed after 105 days on personal jurisdiction grounds — without reaching the merits of the infringement claim.
Design patent suit against Schedule A sellers ends on jurisdiction
On September 5, 2025, plaintiff Jianqun Zhang filed a design patent infringement action in the U.S. District Court for the Northern District of Illinois, Case No. 1:25-cv-10737, presided over by Judge Matthew F. Kennelly. The asserted patent, USD1080919S (application number US29/846848), protects the ornamental design of a ladder stabilizer — a product category heavily traded on e-commerce marketplaces. The defendants were not named individually but identified by reference to a confidential Schedule A, a tactic commonly used in marketplace enforcement actions.
The case closed on December 19, 2025, with a dismissal for lack of personal jurisdiction. This procedural outcome means the court concluded it did not have the authority to exercise jurisdiction over the named defendants — the infringement allegations themselves were never adjudicated on the merits. No basis of termination language specifying ‘with prejudice’ or ‘without prejudice’ is recorded, leaving the refiling implications ambiguous under the public record alone.
A 105-day duration is consistent with early-stage dismissals in Schedule A cases, where courts increasingly scrutinize whether anonymous offshore defendants have sufficient contacts with the forum state. What likely drove this outcome was an inability to establish that the defendants purposefully directed infringing activity at Illinois. The merits of the USD1080919S design claim — and the scope of any alleged infringement — remain entirely untested, leaving the patent’s enforceability unresolved in this proceeding.
Filing to Case Dismissed in 105 days
105-day lifespan — resolved before substantive merits briefing typically begins
Dismissed for lack of personal jurisdiction: what this means for both sides
Personal jurisdiction dismissal — no merits ruling reached
A dismissal for lack of personal jurisdiction is a threshold, procedural ruling. The court determined it lacked the authority to hear the case against these defendants — not that the patent is invalid or that infringement did not occur. The underlying design patent USD1080919S remains legally intact. This type of dismissal does not carry claim preclusion effects on the infringement question itself.
Procedural — no infringement findingAmbiguous record: with or without prejudice not stated
The public docket records ‘Case Dismissed’ without specifying whether the dismissal is with or without prejudice. Jurisdiction-based dismissals are generally without prejudice by default, allowing the plaintiff to refile in a proper forum. However, the public record is silent on this point. Patent holders and their counsel should not assume refiling rights without reviewing the actual court order.
Refiling status unclearSchedule A sellers escape without infringement adjudication
The anonymous defendants identified on Schedule A avoided any merits ruling on infringement of USD1080919S. This outcome is a procedural win — the design patent claim was never tested against their products. However, they remain exposed to future enforcement in a court with proper jurisdiction if the plaintiff identifies the forum where they operate or where their products are directed.
Procedural win for defendantsMarketplace design patent enforcement faces rising jurisdictional scrutiny
This case is consistent with a broader trend in which Northern District of Illinois courts — a historically favored venue for Schedule A e-commerce actions — scrutinise personal jurisdiction over anonymous overseas sellers more rigorously. Design patent holders pursuing marketplace enforcement strategies should expect courts to demand specific evidence linking defendants to the chosen forum, particularly where defendants are offshore entities with no identified physical presence.
Jurisdiction scrutiny risingFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Jianqun Zhang | Individual | Design patent holder asserting ornamental rights in a ladder stabilizer productSearch in Eureka ↗ |
| Defendant | The Individuals, Corporations, Limited Liability Companies, Partnerships, and Unincorporated Associates Identified on Schedule A | Company | Anonymous online marketplace sellers identified on confidential Schedule ASearch in Eureka ↗ |
| Plaintiff counsel | Lance Y. Liu | Attorney | Counsel for Jianqun ZhangSearch in Eureka ↗ |
| Plaintiff law firm | Lance Liu | Law Firm | Representing Jianqun ZhangSearch in Eureka ↗ |
| Presiding judge | Judge Matthew F. Kennelly | Judge | Illinois Northern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The verdict — ‘This case is dismissed for lack of personal jurisdiction’ — is a threshold procedural ruling, not a substantive finding on infringement or validity of USD1080919S. At the district court level, this outcome suggests the court found insufficient contacts between the Schedule A defendants and the state of Illinois to support the exercise of personal jurisdiction under Due Process and applicable long-arm principles. No claim preclusion attaches to the design patent infringement cause of action itself.
USD1080919S — Ladder Stabilizer Ornamental Design Patent
USD1080919S is a U.S. design patent covering the ornamental appearance of a ladder stabilizer — a safety accessory that attaches to the upper rungs or rails of a ladder to provide lateral wall-clearance and stability. Design patents protect the visual, non-functional characteristics of a product. Application number US29/846848 places this filing in the design patent series, and the ‘USD’ prefix confirms grant as a design patent by the USPTO. The protected design has direct commercial relevance in the consumer tools, home improvement, and construction accessories market.
Ladder stabilizers are widely sold through Amazon, eBay, and direct-import e-commerce channels, making them a frequent target for design patent enforcement campaigns against overseas manufacturers and Schedule A sellers. The ornamental scope of USD1080919S determines what competing products infringe — specifically, products that appear substantially similar to an ordinary observer. Companies designing or sourcing competing ladder stabilizer products should evaluate whether their product’s appearance falls within that scope, particularly given the plaintiff’s willingness to litigate in federal court.
Should you run an FTO analysis against USD1080919S?
Any company manufacturing, importing, or selling ladder stabilizers — or accessories with a substantially similar visual profile — should assess freedom-to-operate against USD1080919S. The dismissal in this case was procedural only; the patent is active and enforceable. R&D teams developing products in the ladder accessory or fall-protection equipment space face real infringement exposure if their product’s ornamental design resembles the protected design to an ordinary observer.
PatSnap Eureka’s FTO Search Agent can map the ornamental claim scope of USD1080919S, identify prior art design patents that may constrain enforceability, and flag commercially active similar designs in the ladder accessory space. Running a structured FTO before product launch or import decision avoids costly enforcement actions and provides documented design-around evidence that can be critical in any future litigation.
Run a freedom-to-operate analysis on USD1080919S to assess your product’s exposure
Run FTO in Eureka →Similar Design Patent Cases: Ladder & Tool Accessory Enforcement
Related Schedule A design patent enforcement actions in the Northern District of Illinois targeting ladder, tool, and home improvement accessory sellers.
What this case signals for marketplace design patent enforcement
Schedule A dismissals on jurisdiction grounds are reshaping how plaintiffs structure e-commerce infringement campaigns in federal courts.
Jurisdiction evidence must precede filing in Schedule A cases
Courts in the Northern District of Illinois are increasingly requiring affirmative evidence that anonymous defendants directed activity at the forum. Plaintiffs relying solely on marketplace listings without geo-targeted sales data or Illinois shipping records risk early dismissal before any TRO or asset freeze is granted.
USD1080919S remains enforceable — the design is not invalidated
This dismissal does not diminish the legal force of the ladder stabilizer design patent. Zhang retains the right to pursue infringement claims in a proper forum. Competitors and marketplace sellers should not interpret this case as a signal that the patent has been defeated — it has simply not been adjudicated on its merits.
Zhang v Individuals — key questions answered
The case was dismissed for lack of personal jurisdiction — a threshold procedural ruling meaning the court found it lacked authority over the defendants, not that the infringement claim was without merit. The design patent USD1080919S was never assessed on its merits. In Schedule A cases involving anonymous overseas sellers, establishing sufficient contacts with the forum state is a common and critical obstacle.
No. A dismissal for lack of personal jurisdiction has no effect on patent validity or enforceability. USD1080919S remains a granted U.S. design patent. The court made no ruling on the scope, validity, or infringement of the design claim. The patent holder may pursue enforcement in a different court with proper jurisdiction.
Jurisdiction-based dismissals are generally considered without prejudice, meaning the plaintiff may refile in a court with proper personal jurisdiction over the defendants. However, the public record in this case does not explicitly state whether the dismissal is with or without prejudice. Counsel should review the actual court order before assuming refiling rights.
A ‘Schedule A’ defendant structure allows plaintiffs to file suit against multiple anonymous online sellers without naming them individually in the public complaint. The identities are listed on a confidential schedule filed with the court. This approach is common in marketplace enforcement actions targeting overseas e-commerce sellers on platforms like Amazon or Alibaba, particularly in patent and trademark infringement cases.
USD1080919S is a U.S. design patent covering the ornamental appearance of a ladder stabilizer. It protects the visual design, not the functional mechanics of the product. Any manufacturer, importer, or seller of a ladder stabilizer that appears substantially similar to the patented design to an ordinary observer may face infringement exposure. The patent is particularly relevant for companies sourcing ladder accessories from overseas manufacturers for sale in the U.S. market.
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