Illinois Court Rules No Infringement in Toilet Safety Frame Design Patent Case

Case Overview

The Parties

The Patent at Issue

This landmark case involved U.S. Design Patent No. D988,941 (Application No. 29/708,547) covering the ornamental design of a safety frame for toilets—a category of assistive living and bathroom safety equipment. Design patents protect the *visual appearance* of a product, not its functional aspects.

• • US D988,941 — Ornamental design of a toilet safety frame

The Accused Products

The accused products are toilet safety frames—grab-rail-style assistive devices designed to aid elderly or mobility-impaired users. These products are sold through Amazon and represent a competitive segment increasingly populated by both domestic and international sellers. The specific ASINs at issue identify distinct product listings targeted in the complaint: B0CBJMPYZX and B0CBJZF5V4.

Legal Representation

Plaintiffs were represented by Karolina Jozwiak and Matthew L. De Preter of Aronberg Goldgehn, a well-regarded Chicago-based IP and litigation firm. The defendant, Yu Chen, filed no appearance and retained no counsel of record, resulting in default proceedings.

Litigation Timeline & Procedural History

Filed on July 15, 2025, in the Northern District of Illinois—a court with substantial IP litigation experience—the case moved with notable efficiency. Chief Judge Thomas M. Durkin presided over the matter. The defendant’s failure to appear or respond triggered the default motion process under Fed. R. Civ. P. 55.

The court held a hearing on October 16, 2025, before entering its final order on October 31, 2025. The 108-day total duration from filing to closure reflects an expedited resolution typical of uncontested default proceedings, though the substantive non-infringement determination adds analytical weight beyond standard default dismissals. Venue selection in the Northern District of Illinois aligned with the plaintiffs’ need for a federal forum with accessible jurisdiction over a U.S.-based defendant and experienced IP docket management.

The Verdict & Legal Analysis

Outcome

The court **granted plaintiffs’ Motion for Entry of Default and Default Judgment** in its entirety. The two-part ruling delivered:

1. Non-infringement finding: The ornamental designs of products sold under ASINs B0CBJMPYZX and B0CBJZF5V4 do **not** infringe U.S. Design Patent No. D988,941.
2. Attorneys’ fees award: Plaintiffs are entitled to reasonable attorneys’ fees and costs, with the specific amount to be determined upon submission of a fee petition.

No monetary damages for infringement were awarded, consistent with the non-infringement finding. Specific fee amounts were not disclosed in the judgment order and remain subject to a subsequent court order.

Verdict Cause Analysis

The case was filed as an **infringement action**, but the procedural posture—plaintiffs seeking a declaration that their products do not infringe—functions analytically as a declaratory judgment of non-infringement. The defendant’s complete failure to appear, respond, or contest the allegations left the court to evaluate the complaint and accompanying motion on the merits presented by plaintiffs alone.

Under design patent law, infringement is assessed using the **ordinary observer test** (*Egyptian Goddess, Inc. v. Swisa, Inc.*, 543 F.3d 665 (Fed. Cir. 2008)): whether an ordinary observer, familiar with the prior art, would be deceived into believing the accused design is the same as the patented design. The court’s affirmative non-infringement ruling—even in a default posture—signals that the plaintiffs presented sufficient visual distinction evidence to satisfy this standard.

The **attorneys’ fees award** warrants attention. While fee awards in patent cases typically require findings of exceptionality under 35 U.S.C. § 285, default judgment contexts can support fee recovery under different theories, including bad faith assertion or contractual/statutory bases. The court’s fee award suggests the litigation was found to be justified and the defendant’s failure to engage compounded plaintiffs’ burden.

Legal Significance

This ruling carries several points of legal significance:

• Default judgment does not preclude substantive IP findings. The court did not simply enter default without analysis—it made an affirmative non-infringement determination, which carries real defensive value for the plaintiffs in future marketplace disputes.
• Design patent scope in commodity product markets continues to be tested as global e-commerce sellers seek U.S. IP protection or challenge competitor claims. This case adds to the body of outcomes where design patent assertions against Amazon marketplace sellers are resolved through affirmative litigation rather than mere takedown compliance.
• Fee-shifting in default design patent cases may encourage similarly situated plaintiffs to pursue judicial resolution rather than absorbing marketplace disruption costs.

Strategic Takeaways

For Patent Holders: Asserting design patents against active marketplace sellers carries real litigation risk. Failure to defend a claim invites default judgments with non-infringement findings and fee exposure—outcomes that undermine the commercial leverage typically sought through IP assertion.

For Accused Infringers/Proactive Plaintiffs: Filing an affirmative action to secure a non-infringement determination—rather than waiting for a lawsuit—can efficiently resolve marketplace threats and create documented legal protection. Selecting experienced IP litigation counsel in a well-resourced district amplifies this strategy.

For R&D Teams: Products with functional similarities but distinct ornamental appearances can withstand design patent challenges when properly documented. Maintaining visual differentiation records and product development files supports FTO (freedom-to-operate) positions.

Industry & Competitive Implications

The bathroom safety and assistive living equipment market—including toilet safety frames, grab bars, and related products—is a growing segment driven by aging demographics in the United States. This market is increasingly contested on Amazon by international sellers, many based in China, competing with domestically held IP portfolios.

This case reflects a broader trend: Chinese e-commerce sellers proactively litigating U.S. design patent disputes rather than accepting ASIN suspensions or settlement demands. By securing a default judgment of non-infringement with attorneys’ fees, Yunnan Lamujia established a documented legal defense posable in future enforcement or marketplace reinstatement proceedings.

For IP professionals advising companies in the consumer safety product space, this case signals that design patent portfolios covering commodity assistive devices face meaningful litigation risk when asserted without evidentiary support—particularly when the patent holder lacks resources or willingness to mount a defense.

Licensing strategy in this sector should account for the relative ease with which determined marketplace sellers can obtain judicial non-infringement findings in default scenarios, potentially weakening the leverage value of design patent portfolios in assertion campaigns.

❓ FAQ

What patent was at issue in Yunnan Lamujia v. Yu Chen?

U.S. Design Patent No. D988,941 (Application No. 29/708,547), covering the ornamental design of a safety frame for toilets.

What was the basis for the non-infringement ruling?

The court granted default judgment after the defendant failed to appear, finding that the plaintiffs’ products (ASINs B0CBJMPYZX and B0CBJZF5V4) do not infringe the ornamental design claimed in D988,941.

How might this verdict affect design patent litigation in assistive products?

It signals that proactive non-infringement litigation by international e-commerce sellers is an increasingly viable strategy, and that undefended design patent assertions risk producing fee-shifting default judgments.

Cases to Watch: Related design patent disputes involving assistive living products and Amazon marketplace enforcement actions in the Northern District of Illinois.

Related Resources: USPTO Design Patent Database | PACER Case Lookup – Case No. 1:25-cv-08022 | Northern District of Illinois IP Docket