DCT

1:26-cv-02343

Hangzhou Yingsen Technology Co Ltd v. Shi

Log In
Key Events
Complaint
complaint Intelligence

I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 1:26-cv-02343, D. Md., 06/11/2026
  • Venue Allegations: Venue is asserted based on the Defendants being residents of the State of Maryland.
  • Core Dispute: Plaintiffs seek a declaratory judgment that Defendant Xiao Shi's patent on buckle-resistant vehicle sunshades is invalid, unenforceable, and not infringed by Plaintiffs' sunshade products, following infringement complaints filed by Defendants with Amazon.com that led to the removal of Plaintiffs' listings.
  • Technical Context: The technology concerns foldable vehicle sunshades designed with internal reinforcement to prevent them from bending or buckling away from the window during use, a common issue with larger shades.
  • Key Procedural History: The lawsuit was precipitated by infringement notices that Defendants allegedly sent to Amazon.com in June 2026, asserting U.S. Patent No. 12,576,697 against Plaintiffs' products. These notices resulted in the removal of Plaintiffs' product listings from the e-commerce platform. Plaintiffs allege their own products, sold since 2021, constitute invalidating prior art to the patent, which has a 2025 application filing date.

Case Timeline

Date Event
2021 Plaintiffs allege they began selling the "Removed Products" Compl. ¶27
2023 Plaintiffs allege Defendants began selling their subject products Compl. ¶29
2025-02-21 '697 Patent application filed / Priority Date Compl. ¶27 '697 Patent, (22)
2026-03-17 U.S. Patent No. 12,576,697 issues Compl. ¶12 '697 Patent, (45)
June 2026 Plaintiffs receive infringement notices from Amazon.com Compl. ¶17
2026-06-11 Complaint for Declaratory Judgment filed Compl. p. 1

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

U.S. Patent No. 12,576,697 - "REINFORCEMENT ELEMENT FOR SUN SHADES, BUCKLE RESISTANT SUN SHADES, SUN SHADES FOR VEHICLES, AND METHOD OF MAKING SAME"

The Invention Explained

  • Problem Addressed: The patent's background section notes that typical vehicle sunshades "tend to blow or bend away from the inner surface of vehicle windows during use," which can be caused by humidity, temperature, or the large size of the window, thereby reducing the product's durability and service life ʼ697 Patent, col. 1:12-16
  • The Patented Solution: To solve this, the invention proposes a foldable sunshade that incorporates a "reinforcement member" to provide stiffness and resistance to buckling ʼ697 Patent, abstract This member is preferably located within a "pocket" inside the shade body and can have a specific cross-sectional shape, such as an arc, to enhance its structural integrity when positioned against a window ʼ697 Patent, col. 1:40-54 ʼ697 Patent, Fig. 9 The complaint reproduces figures from the patent showing the sunshade installed in a vehicle and in a flat configuration Compl. ¶13
  • Technical Importance: This design aims to improve the in-use stability and durability of foldable sunshades, making them more effective and reliable, particularly for vehicles with large windshields or side windows ʼ697 Patent, col. 1:12-16

Key Claims at a Glance

  • The complaint seeks a declaratory judgment of non-infringement for the entire patent but does not specify which claims Defendants asserted in their notices to Amazon. The following analysis focuses on independent claim 1 as a representative claim.
  • The essential elements of independent claim 1 include:
    • A shade body configured for positioning inside a vehicle window, comprising a filler material and an outer lining.
    • The shade body defines a plurality of sub-panels connected by flexible joints.
    • A pocket extending in a vertical direction, adjacent to a flexible joint, which defines a channel.
    • A reinforcement member located within the pocket's channel to provide stiffness and make the sunshade "resistant to buckling inwardly away from the inner surface of window."
    • A specific flexible joint structure that comprises: (a) a seam forming one edge of an elongated chamber containing the filler material, (b) an "inward indentation" in the shade's surface forming the opposite edge of the chamber, and (c) the seam also securing a lateral side of the pocket.
  • The complaint does not mention any specific dependent claims.

III. The Accused Instrumentality

Product Identification

The products at issue are Plaintiffs' "vehicle sunshade products," sold on Amazon.com and identified in the complaint as the "Removed Products" Compl. ¶¶9, 11 A table lists the products by their unique Amazon Standard Identification Numbers (ASINs) Compl. ¶11

Functionality and Market Context

The complaint describes the products as being similar to those sold by the Defendants Compl. ¶16 It alleges that Plaintiffs have been "tremendously successful" in selling these sunshades on multiple online platforms since 2021 Compl. ¶10 The complaint does not provide specific technical details about the construction or materials of the "Removed Products," focusing instead on their commercial history as the basis for its invalidity claims Compl. ¶27

IV. Analysis of Infringement Allegations

The complaint is for a declaratory judgment of non-infringement and does not contain infringement allegations or a claim chart. Instead, it reports that Defendants sent notices to Amazon.com alleging that Plaintiffs' vehicle sunshades infringed the '697 Patent, which led to the products' removal Compl. ¶17 Compl. ¶20 The complaint provides a screenshot of an example notice, which identifies the patent number but does not articulate a specific theory of infringement Compl. ¶18 Without a proffered infringement theory from the Defendants, a direct analysis of infringement allegations is not possible.

Identified Points of Contention

  • Technical Questions: A central factual question for the court will be whether Plaintiffs' sunshades, which they have sold since 2021, actually incorporate the features recited in the '697 Patent's claims. For claim 1, this would involve determining if Plaintiffs' products contain a "reinforcement member" within a "pocket", and, critically, whether they employ the highly specific "flexible joint" structure formed by the combination of a seam and an "inward indentation."
  • Scope Questions: The case presents a significant legal and factual question regarding the interplay between infringement and validity. Plaintiffs allege their own products, sold before the patent's critical date, constitute invalidating prior art Compl. ¶27 This suggests that if Defendants' infringement allegations are proven true, that same evidence may also serve to invalidate the patent under the on-sale bar of 35 U.S.C. § 102(a)(1).

V. Key Claim Terms for Construction

While the complaint does not raise specific claim construction disputes, the patent's language suggests certain terms will be central to resolving the case.

The Term: "reinforcement member"

  • Context and Importance: This term is the core of the claimed invention, responsible for providing the novel "buckling resistance." The scope of this term will dictate what kind of internal supports fall within the claims.
  • Intrinsic Evidence for a Broader Interpretation: The specification describes the member in broad terms as potentially being an "elongated metallic, alloy, plastic, composite member, or polymeric member" '697 Patent, col. 2:65-68, which could support an interpretation covering a wide variety of stiffening inserts.
  • Intrinsic Evidence for a Narrower Interpretation: The patent repeatedly illustrates and describes embodiments where the member has a specific, non-planar cross-section (e.g., arcuate, W-shaped, corrugated) and is "oriented to be concave to the viewer" to achieve its function '697 Patent, col. 2:26-29 '697 Patent, claim 17 A party could argue these specific structural characteristics are necessary features of the claimed "reinforcement member".

The Term: "flexible joint"

  • Context and Importance: Claim 1 recites a detailed, multi-part structure for at least one "flexible joint". Its interpretation is critical because a finding of infringement under this claim would require an accused product to meet all of these structural limitations.
  • Intrinsic Evidence for a Broader Interpretation: The term itself is common, and a party might argue it should be given its plain and ordinary meaning of a part that allows folding.
  • Intrinsic Evidence for a Narrower Interpretation: Claim 1 explicitly defines the joint's structure as comprising an "elongated chamber" whose parallel edges are formed by two different features: "one of the plurality of seams" and an "inward indentation in the first major surface" '697 Patent, col. 12:50-col. 13:5 This highly detailed definition provided within the claim itself strongly suggests a narrow construction limited to this precise arrangement.

VI. Other Allegations

Invalidity

The complaint's first count seeks a declaratory judgment that the '697 Patent is invalid. It alleges anticipation under 35 U.S.C. § 102 and obviousness under 35 U.S.C. § 103 Compl. ¶25 The primary factual basis for this claim is the public sale of Plaintiffs' own "Removed Products" on Amazon.com since 2021, which Plaintiffs contend constitutes invalidating prior art under the on-sale bar of 35 U.S.C. § 102(a)(1) because the sales occurred more than one year before the patent's February 21, 2025 application date Compl. ¶27

Unenforceability

The complaint also alleges the '697 Patent is unenforceable due to "fraudulent misrepresentations to the USPTO regarding the Patent's 'originality'" Compl. ¶25 and an alleged failure by the applicant to disclose Plaintiffs' prior art during prosecution Compl. ¶29 These allegations may form the basis of an inequitable conduct claim.

Exceptional Case

Plaintiffs demand that the case be declared "exceptional" under 35 U.S.C. § 285, which would entitle them to an award of reasonable attorney fees, likely based on the allegations of misrepresentation to the USPTO Compl. Prayer c

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

This declaratory judgment action appears poised to turn on the resolution of several key, interrelated questions:

  • A primary question will be one of identity and timing: Are the Plaintiffs' "Removed Products," which have been on sale since 2021, substantially the same as the invention claimed in the '697 Patent? An affirmative answer could place the patent holder in a difficult position, where evidence supporting an infringement claim could simultaneously prove the patent is invalid under the on-sale bar.
  • A key issue for infringement will be technical and structural correspondence: Assuming the patent is valid, do Plaintiffs' products meet the specific and detailed structural limitations of the asserted claims? The analysis may focus on whether the accused products contain not just a generic stiffener, but the precise "reinforcement member" within a "pocket" and the specific "flexible joint" structure recited in claims like claim 1.
  • A third question concerns patent prosecution and enforceability: Can Plaintiffs prove that the patent applicant, Defendant Xiao Shi, knew of Plaintiffs' pre-existing products and, with an intent to deceive, failed to disclose them to the USPTO during prosecution? The outcome of this factual inquiry will determine the viability of Plaintiffs' request to have the patent declared unenforceable.