2:25-cv-00350
Shantou Juhe Home Furnishings Co Ltd v. Dbest Products Inc
I. Executive Summary and Procedural Information
- Parties & Counsel:
- Plaintiff: Shantou Juhe Home Furnishings Co., Ltd., et al. (People's Republic of China)
- Defendant: dbest products, Inc. (California)
- Plaintiff's Counsel: Dinsmore & Shohl LLP; Glacier Law LLP
- Case Identification: 2:25-cv-00350, C.D. Cal., 05/02/2025
- Venue Allegations: Venue is asserted as proper in the Central District of California because the Defendant is incorporated, maintains its principal place of business, and conducts substantial business operations in California. The complaint also notes that the events giving rise to the claim, including the alleged infringement, occurred in the district.
- Core Dispute: Plaintiffs seek a declaratory judgment that their storage bin products do not infringe Defendant's patent on stackable collapsible carts and/or that the patent is invalid, following Defendant's infringement complaints to Amazon.com which resulted in the removal of Plaintiffs' product listings.
- Technical Context: The technology relates to collapsible storage carts, a consumer product category where innovations in folding mechanisms, durability, and storage convenience are key market differentiators.
- Key Procedural History: This declaratory judgment action was initiated after Defendant filed patent infringement complaints with Amazon.com, leading to the delisting of Plaintiffs' products. The complaint asserts specific prior art references (one Chinese and one U.S. publication) as a basis for its invalidity claims.
Case Timeline
| Date | Event |
|---|---|
| 2020-01-06 | '576 Patent Priority Date |
| 2024-10-01 | '576 Patent Issue Date |
| 2024-11-26 | Plaintiff JXN receives Amazon delisting notice |
| 2024-12-05 | Plaintiff S.BStore receives Amazon delisting notice |
| 2024-12-09 | Plaintiff JH.HOME receives Amazon delisting notice |
| 2024-12-20 | Plaintiff Meng.HOME receives Amazon delisting notice |
| 2025-01-13 | Original Complaint Filing Date |
| 2025-05-02 | Second Amended Complaint Filing Date |
II. Technology and Patent(s)-in-Suit Analysis
Patent Identification: U.S. Patent No. 12,103,576, "STACKABLE COLLAPSIBLE CARTS," issued October 1, 2024. ('576 Patent)
The Invention Explained:
- Problem Addressed: The patent's background suggests that prior art collapsible carts may have sidewalls that are not "sufficiently sturdy to allow for transporting heavy objects" '576 Patent, col. 1:21-24
- The Patented Solution: The patent describes a collapsible cart with a rigid frame that can transition between a folded and an expanded state '576 Patent, abstract The invention's core is a specific sidewall construction, where at least one sidewall comprises multiple panels (e.g., a "first right panel rotatably coupled to a second right panel") that are locked together in the open position by a "slideable member" moving along a "track" '576 Patent, abstract '576 Patent, col. 7:4-15 This mechanism is designed to enhance the structural rigidity of the cart when it is assembled for use.
- Technical Importance: The design aims to improve the strength and stability of collapsible carts, a recurring challenge in a product category that seeks to balance portability with load-bearing capacity.
Key Claims at a Glance:
The complaint asserts non-infringement of independent claims 1, 11, and 15 Compl. ¶25Independent Claim 1:
- A collapsible cart with a rigid frame and inwardly folding sidewalls.
- A right sidewall comprising a first right panel rotatably coupled to a second right panel.
- The second right panel is proportioned to fit within an opening in the first right panel.
- A "first track" formed along both the first and second right panels.
- A "first slideable member" that is movable along the track to selectively lock the first right panel to the second right panel.
Independent Claim 11:
- A cart with an inwardly folding right sidewall comprising a first, second, and third right panel.
- The second and third panels conform in shape to collectively cover the opening in the first panel.
- The second right panel comprises a ribbed wall.
- A "first lock assembly integrated with the first right panel and the second right panel" with conditions for locking and unlocking the panels.
Independent Claim 15:
- A stackable collapsible cart with an inwardly folding right sidewall comprising a first and second panel.
- A "first lock assembly" to lock the panels.
- A wheel assembly coupled to the bottom wall.
- A rigid top cover with an "indentation pattern" aligned with the wheel's vertical axis, configured to receive a wheel assembly from another identical cart when stacked.
The complaint notes that if the independent claims are not infringed, the dependent claims are not infringed either Compl. ¶32
III. The Accused Instrumentality
Product Identification: The accused products are identified as "Storage Bins" sold by the Plaintiffs on the Amazon.com marketplace under various brand names and ASINs (Compl. ¶7; Compl. ¶8; Compl. ¶9; Compl. ¶10; Compl. ¶11; Compl. ¶12; Compl. ¶13; Compl. ¶14; Compl. ¶15; Compl. ¶16; Compl. ¶17).
Functionality and Market Context:
- The complaint alleges that the accused Storage Bins use a different mechanism to secure their side panels than what is claimed in the
['576](https://ai-lab.exparte.com/patent/12103576) Patent. Specifically, the side doors are allegedly secured either by "magnetic attraction" between a magnetic object and a magnet on the frame, or through a "snap-fit structure" Compl. ¶¶30-31 - The complaint emphasizes the commercial importance of the Amazon marketplace, stating it is the Plaintiffs' "primary sales channel" and that the delisting of their products has caused "immediate and irreparable harm" and "significant damages" Compl. ¶19 Compl. ¶34
- The complaint alleges that the accused Storage Bins use a different mechanism to secure their side panels than what is claimed in the
IV. Analysis of Infringement Allegations
The complaint seeks a declaratory judgment of non-infringement. The central argument is that the accused products lack the specific locking mechanism recited in the ['576](https://ai-lab.exparte.com/patent/12103576) Patent claims. The complaint provides a visual chart to illustrate this distinction Compl. ¶29 The image on the left, taken from the ['576](https://ai-lab.exparte.com/patent/12103576) Patent's figures, depicts the claimed sliding lock mechanism Compl. ¶29 The images on the right are photographs of the Plaintiffs' product, showing magnets used for closure Compl. ¶29
'576 Patent Infringement Allegations
| Claim Element (from Independent Claim 1) | Alleged Non-Infringing Functionality | Complaint Citation | Patent Citation |
|---|---|---|---|
| a first track formed along the first right panel and the second right panel extending from a first position on the first right panel to a second position on the second right panel; and | Plaintiffs allege their Storage Bins lack the claimed track and sliding member. The complaint states the products do not require a "sliding locking mechanism." | ¶29; ¶30 | col. 7:4-8 |
| a first slideable member cooperatively engaged to the first track, the first slideable member is movable along the first track between an open position to a closed position to selectively lock the first right panel to the second right panel... | Instead of a sliding member on a track, Plaintiffs' products allegedly use either "magnetic attraction" or a "snap-fit structure" to secure the side panels. | ¶30; ¶31 | col. 7:4-15 |
- Identified Points of Contention:
- Scope Questions: The dispute may center on the scope of the terms "first slideable member" and "lock assembly." A primary question for the court will be whether a magnetic closure or a snap-fit mechanism can be considered equivalent to the claimed "slideable member" that moves along a "track." The complaint argues the mechanisms are "completely different," suggesting a significant dispute over the doctrine of equivalents Compl. ¶31
- Technical Questions: What is the precise structure and operation of the "snap-fit structure" used by the S.BStore products Compl. ¶31? The complaint provides more detail on the magnetic mechanism than the snap-fit version, and evidence on the latter's functionality may become a focus.
V. Key Claim Terms for Construction
The Term: "a first slideable member cooperatively engaged to the first track" (from Claim 1)
Context and Importance: This term is at the core of the non-infringement dispute. Plaintiffs' primary argument is that their products, which allegedly use magnets or snap-fits, do not contain this specific claimed mechanism Compl. ¶¶29-30 The construction of this term will be critical in determining literal infringement.
Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: A party arguing for a broader scope might contend that "slideable member" could encompass any part that moves relative to another to effect a lock, but this is a difficult position given the explicit "track" limitation. They may focus on the term's function-locking the panels-to argue for equivalence.
- Evidence for a Narrower Interpretation: The claim language itself, which requires both a "track" and a "slideable member" that is "movable along the first track," suggests a specific translational motion '576 Patent, col. 11:61-63 The patent specification further supports this by describing a member that engages a track to secure panels '576 Patent, col. 7:4-15 and providing illustrations such as FIG. 42B, which shows a distinct sliding lock component.
The Term: "lock assembly" (from Claims 11, 15)
Context and Importance: This term is more general than the "slideable member" in Claim 1. Its construction will be crucial for determining the infringement scope of Claims 11 and 15. Practitioners may focus on this term because its potential breadth could be used by the patentee to argue that it covers a wider range of fastening mechanisms, including those in the accused products.
Intrinsic Evidence for Interpretation:
- Evidence for a Broader Interpretation: The term "lock assembly" on its own could be argued to be a generic functional description for any components that work together to lock something.
- Evidence for a Narrower Interpretation: The specification appears to only disclose one type of locking mechanism: the sliding member on a track '576 Patent, col. 9:23-28 '576 Patent, Fig. 42A A party could argue that "lock assembly" should be limited to this disclosed embodiment and its equivalents, and does not encompass fundamentally different technologies like magnetic attraction.
VI. Other Allegations
Indirect Infringement: The complaint seeks a declaration that the Plaintiffs' products do not "directly or indirectly" infringe the
['576](https://ai-lab.exparte.com/patent/12103576) PatentCompl. ¶7 No specific facts related to inducement or contributory infringement are alleged; rather, a blanket declaration of non-infringement for all forms is sought Compl. ¶35Willful Infringement: Willfulness is not at issue in this declaratory judgment complaint filed by the accused infringers.
VII. Analyst's Conclusion: Key Questions for the Case
This case presents two fundamental disputes common in patent litigation, framed here in a declaratory judgment context:
A central question of claim scope and technical equivalence: Can the patent's claims, which describe a specific "slideable member" on a "track" (Claim 1) or a more general "lock assembly" (Claims 11, 15), be interpreted to cover the magnetic and snap-fit closure mechanisms allegedly used in Plaintiffs' products? The outcome will depend heavily on claim construction and the court's analysis under the doctrine of equivalents.
An issue of validity based on prior art: Will the prior art references cited by the Plaintiffs-a Chinese patent publication ("Song") and a U.S. patent publication ("Darren") Compl. ¶¶39-40-be found to anticipate or render obvious the claimed invention, particularly its combination of a multi-panel folding wall with an integrated locking feature?