Wu v. Partnerships Unincorp Associations

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Juanren Wu (Individual)
  • Defendant: The Partnerships and Unincorporated Associations Identified on Schedule "A"
  • Plaintiff's Counsel: Ford Banister LLC
• Case Identification: 1:26-cv-04933, N.D. Ill., 04/29/2026
• Venue Allegations: Venue is alleged to be proper because Defendant targets consumers in the United States, including Illinois, through interactive e-commerce stores operating under specified aliases.
• Core Dispute: Plaintiff alleges that Defendant's online stores sell "diamond paint pen" products that infringe a U.S. design patent for a painting pen tip.
• Technical Context: The technology relates to tools for the craft hobby of diamond painting, where small faceted resins are applied to an adhesive canvas.
• Key Procedural History: The complaint alleges that Plaintiff's products embodying the patented design are marked in compliance with 35 U.S.C. § 287(a). Plaintiff also notes the implementation of a "brand protection program" to investigate online marketplace listings.

Case Timeline

Date	Event
2021-10-06	D'230 Patent Filing (Priority) Date
2024-10-29	D'230 Patent Issue Date
2026-04-29	Complaint Filing Date

II. Technology and Patent(s)-in-Suit Analysis

U.S. Design Patent No. D1,049,230 S - "Painting Pen Tip"

• Patent Identification: U.S. Design Patent No. D1,049,230 S ("Painting Pen Tip"), issued October 29, 2024 (the "D'230 Patent").

The Invention Explained

• Problem Addressed: As a design patent, the D'230 Patent does not articulate a technical problem. Its purpose is to protect the novel, non-functional, ornamental appearance of an article of manufacture. The complaint asserts that products with this design have become "enormously popular" and "instantly recognizable" within the diamond painting community Compl. ¶¶7-8
• The Patented Solution: The patent protects the specific ornamental design for a painting pen tip as depicted in the patent's figures D'230 Patent, CLAIM The design consists of a conically flared main body that tapers to a narrow tip, which then connects to a base section featuring a series of distinct annular grooves, presumably for attachment to a pen body D'230 Patent, Figs. 2-7 The broken lines in the drawings indicate that the pen body itself is not part of the claimed design D'230 Patent, DESCRIPTION
• Technical Importance: The complaint alleges that the patented design is "distinctive" and has come to be associated by the public with the "quality and innovation" of Plaintiff's products Compl. ¶9

Key Claims at a Glance

• Design patents contain a single claim, which is pictorial in nature.
• The asserted claim is for "The ornamental design for a painting pen tip as shown and described" D'230 Patent, CLAIM
• The essential elements are the visual features of the tip as a whole, including:
  • A conically shaped upper body
  • A tapered tip portion
  • A base with a series of annular rings or grooves

III. The Accused Instrumentality

Product Identification

• The accused instrumentalities are "Unauthorized Products," specifically diamond paint pen products, allegedly sold by Defendant through various e-commerce stores operating under aliases listed in Schedule A Compl. ¶4 Compl. ¶9

Functionality and Market Context

• The complaint alleges that Defendant operates one or more interactive e-commerce stores that target consumers throughout the United States, including Illinois Compl. ¶3 These stores are said to offer for sale, sell, and import products that embody the design of the D'230 Patent Compl. ¶4 Compl. ¶29 The Defendant is described as an entity of unknown makeup, believed to reside in China or another foreign jurisdiction, that uses concealment tactics such as multiple seller aliases to avoid detection and liability Compl. ¶11 Compl. ¶15

IV. Analysis of Infringement Allegations

The complaint alleges that the Unauthorized Products infringe the D'230 Patent directly and/or through the doctrine of equivalents Compl. ¶29 The test for design patent infringement is whether an "ordinary observer," giving such attention as a purchaser usually gives, would be deceived into purchasing the accused product believing it to be the patented design. The complaint includes a figure of the patented design to support its allegations. This figure, showing side and top-down views of the claimed design, is presented as representative of the ornamental design that Defendant has allegedly infringed Compl. ¶9

The complaint does not provide images of the accused "Unauthorized Products" for a side-by-side comparison. The infringement allegation rests on the assertion that Defendant is making, using, or selling products that embody the ornamental design shown below.

D'230 Patent Infringement Allegations

Claim Element (from the D'230 Patent Figures)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
The ornamental design for a painting pen tip as shown and described.	Defendant is making, using, offering for sale, selling, and/or importing into the United States...the Unauthorized Products that infringe directly and/or through the doctrine of equivalents the ornamental design claimed in the Paint Pen Patent.	¶29	Figs. 1-9
A conically flared main body tapering to a narrow tip.	The complaint alleges the "Unauthorized Products" embody the patented design, which includes this feature.	¶29	Fig. 4
A base portion comprising a series of annular grooves.	The complaint alleges the "Unauthorized Products" embody the patented design, which includes this feature.	¶29	Fig. 4

• Identified Points of Contention:
  • Evidentiary Question: A central issue will be the evidentiary showing. The complaint does not contain images of the accused products. The Plaintiff will need to produce evidence, such as test purchases, demonstrating that the products sold by the Defendant are visually substantially the same as the design claimed in the D'230 Patent.
  • Scope Question: The scope of a design patent is determined by comparing it to the prior art. The ultimate infringement analysis may depend on what aspects of the D'230 Patent's design are found to be novel over prior art pen tips, which could narrow or broaden the scope of protection available to the Plaintiff.

V. Key Claim Terms for Construction

In design patent litigation, the claim is defined by the drawings, and the analysis typically focuses on a comparison of the overall visual appearance rather than the construction of specific textual terms. The claim of the D'230 patent is simply "the ornamental design for a painting pen tip as shown and described" D'230 Patent, CLAIM The complaint does not provide a basis for a traditional claim construction analysis of any specific terms. The dispute will likely not center on the definition of a word but on the application of the "ordinary observer" test to compare the patented design with the accused products.

VI. Other Allegations

• Indirect Infringement: The prayer for relief seeks to enjoin Defendant from "aiding, abetting, contributing to, or otherwise assisting anyone" in infringing the patent, which suggests a theory of indirect infringement Compl. Prayer 1(b) The factual basis for this appears rooted in Defendant's alleged operation of e-commerce storefronts that facilitate the sale of infringing products to consumers Compl. ¶4 Compl. ¶16
• Willful Infringement: The complaint alleges that Defendant has "knowingly and willfully" sold infringing products Compl. ¶13 Compl. ¶25 It seeks a formal judgment of willful infringement and treble damages Compl. Prayer 2 Compl. Prayer 4 The allegations supporting willfulness appear to be based on the general assertion that operators of such online stores are aware they are infringing and engage in fraudulent conduct, such as using false names and maintaining offshore accounts, to conceal their infringement Compl. ¶19 Compl. ¶21 Compl. ¶22

VII. Analyst's Conclusion: Key Questions for the Case

• 1. The Identification and Enforcement Question: A primary challenge in this type of "Schedule A" litigation is practical: can the Plaintiff successfully identify the anonymous operators behind the e-commerce aliases, establish jurisdiction, and enforce any resulting judgment, given the allegations of deliberate concealment and operation from foreign jurisdictions?
• 2. The "Ordinary Observer" Test: Once accused products are identified, a key legal question will be one of visual comparison: will an ordinary observer, familiar with the prior art, find the overall ornamental design of the accused products to be substantially the same as the design claimed in the D'230 Patent, or are there sufficient visual differences to avoid infringement?
• 3. The Evidentiary Burden: A critical threshold question will be one of proof: what evidence will the Plaintiff provide to link the specific, anonymous online storefronts to the sale of products that actually embody the patented design, especially given the absence of accused product images in the initial complaint?