Foshan Huiya Ziyi E Commerce Co Ltd v. Hyper Ice Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Foshan Huiya Ziyi E-commerce Co., Ltd. & Putian Licheng District Langtangqu Trading Co., Ltd. (People's Republic of China)
  • Defendant: Hyper Ice, Inc. (California) & Hyperice IP Subco, LLC (Delaware)
  • Plaintiff's Counsel: Dinsmore & Shohl LLP
• Case Identification: 8:25-cv-00657, C.D. Cal., 07/22/2025
• Venue Allegations: Venue is alleged to be proper as Defendants reside in the district and because a substantial part of the events giving rise to the claim, specifically Defendants' filing of patent infringement reports through Amazon, occurred in the judicial district.
• Core Dispute: Plaintiffs seek a declaratory judgment of non-infringement and invalidity for three patents related to percussive massage devices, following infringement reports filed by Defendants with Amazon.com that targeted Plaintiffs' products.
• Technical Context: The technology concerns handheld percussive massage devices, a product category that has gained significant market traction for personal therapeutic use, muscle recovery, and pain relief.
• Key Procedural History: The dispute began when Defendants filed infringement reports with Amazon against Plaintiffs' massager products, first alleging infringement of the '051 Patent and later the '082 Patent, which resulted in the delisting of Plaintiffs' products. After Plaintiffs initiated this declaratory judgment action, Defendants asserted a counterclaim for infringement of a third patent, the '826 Patent, prompting Plaintiffs to file this amended complaint to resolve the controversies over all three patents.

Case Timeline

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

U.S. Patent No. 12,208,051 - "Massage Device with a Releasable Connection for a Massaging Head"

• Patent Identification: U.S. Patent No. 12,208,051, issued on January 28, 2025 Compl. ¶¶41; Compl. ¶44

The Invention Explained

• Problem Addressed: The patent's background describes prior art vibrating massage devices as suffering from deficiencies such as being "bulky, get very hot, are noisy and/or are difficult to use for extended periods of time" '051 Patent, col. 1:31-36
• The Patented Solution: The invention is a handheld percussive massager featuring a motor that drives a piston in a reciprocating motion to create a massage effect '051 Patent, abstract A central feature is a "quick-connect system" that enables a user to attach or detach different massage heads from the piston, with the patent noting this can be done "without turning off the massaging device" '051 Patent, col. 6:55-56 The design, illustrated in Figure 1, also contemplates cooling mechanisms such as a heat sink and fan to address overheating '051 Patent, col. 5:6-9 Compl. p. 9 The complaint includes an annotated image of FIG. 1 from the patent to illustrate the disclosed device Compl. p. 9
• Technical Importance: The claimed ability to swap massage heads while the device remains operational suggests an improvement in user convenience and efficiency during a massage or therapy session.

Key Claims at a Glance

• The complaint identifies Claim 1 as the sole independent claim asserted Compl. ¶46
• The essential elements of Claim 1 are:
  • a housing;
  • a piston with a proximal end and a distal end, where the distal end has a bore;
  • a motor connected to the piston's proximal end, configured to make the piston reciprocate at a first speed;
  • a bearing to help constrain the piston's reciprocation;
  • a drive mechanism to determine a predetermined stroke length; and
  • a quick-connect system at the piston's distal end for a massage head, which allows the head to be "inserted into or removed from the bore while the piston reciprocates."
• The patent contains fourteen dependent claims that further refine these elements Compl. ¶45

U.S. Patent No. 11,938,082 - "Massage Device Having Variable Stroke Length"

• Patent Identification: U.S. Patent No. 11,938,082, issued on March 26, 2024 Compl. ¶¶58; Compl. ¶61

The Invention Explained

• Problem Addressed: The '082 Patent stems from the same family as the '051 Patent and addresses the same general problems of prior art massagers being bulky, hot, and noisy '082 Patent, col. 1:31-36
• The Patented Solution: The patented solution is a handheld percussive massager, depicted in an annotated FIG. 1 within the complaint Compl. p. 12 While sharing the core architecture of the '051 Patent, this patent's claims and specification place emphasis on controlling the massage depth via a "lost motion system for varying the stroke of the piston" '082 Patent, col. 2:44-46 '082 Patent, Fig. 7 The invention also incorporates the "quick-connect system" that permits changing massage heads while the piston is in motion '082 Patent, col. 6:55-56
• Technical Importance: A variable stroke length provides users with the ability to customize the intensity and depth of the percussion, adapting the therapy for different muscle groups or personal preferences.

Key Claims at a Glance

• The complaint identifies two independent claims: Claim 1 (apparatus) and Claim 18 (method) Compl. ¶62
• The essential elements of Claim 1 include:
  • a housing;
  • a piston with a bore at its distal end;
  • a motor to reciprocate the piston at a first speed;
  • a drive mechanism to control a predetermined stroke length; and
  • a quick-connect system allowing the massage head to be inserted or removed "while the piston reciprocates."
• Claim 18 is a method claim that, as the complaint notes, "essentially 'repackages' the structural limitations of Claim 1 into a method of assembly" Compl. ¶¶64-65 It requires the steps of operatively connecting the motor, providing the drive mechanism, and providing the quick-connect system.
• The patent includes sixteen dependent claims Compl. ¶62

U.S. Patent No. 12,133,826 - "Massage Device With a Releasable Connection for a Massing Head"

• Patent Identification: U.S. Patent No. 12,133,826, issued on November 5, 2024 Compl. ¶¶69; Compl. ¶72
• Technology Synopsis: The '826 Patent discloses a percussive massager comprising a housing, a motor, a piston, and a drive mechanism. The drive mechanism is specified as including "a flywheel operatively connected to the output shaft of the motor" '826 Patent, claim 1 Like the other asserted patents, it claims a "quick-connect system" allowing a user to connect or remove a massage head "while the piston reciprocates" Compl. ¶¶70; Compl. ¶74
• Asserted Claims: Claim 1 is the sole independent claim Compl. ¶74
• Accused Features: The complaint denies that Plaintiffs' "Accused Products" infringe any valid claim of the '826 Patent Compl. ¶77

III. The Accused Instrumentality

Product Identification

• The accused products are two models of handheld massagers sold by Plaintiffs on Amazon: Model No. JA-G4 (the "10mm Massager") and Model No. JA-G5 (the "12mm Massager") Compl. ¶30

Functionality and Market Context

• The complaint identifies the products as "various massagers" and provides images showing them to be gun-shaped, handheld percussive massage devices with interchangeable applicator heads Compl. p. 6 Compl. p. 7 The product image for the "10mm Massager" shows the device, its packaging, and several interchangeable heads Compl. p. 6 The complaint does not provide further technical details on the products' operation.
• Plaintiffs allege that their Amazon storefront is their "only sales channel in the United States," making the delisting of these products due to Defendants' infringement reports particularly harmful to their business Compl. ¶36

IV. Analysis of Infringement Allegations

The complaint, being a declaratory judgment action for non-infringement, does not provide detailed allegations mapping claim elements to the Accused Products. Instead, it makes general denials of infringement Compl. ¶56 Compl. ¶67 The Plaintiffs' primary arguments focus on the alleged invalidity of the patents over prior art that they claim has existed for over 100 years Compl. ¶¶48-55 Compl. ¶66 As no affirmative infringement theory is presented in the provided document, a claim chart summary cannot be constructed.

• Identified Points of Contention:
  • Invalidity: A central contention raised by the Plaintiffs is that the claimed inventions are invalid under 35 U.S.C. §§ 102, 103, and/or 112 Compl. ¶13 They argue that "electric percussive massagers were known prior to the filing date" and cite several prior art examples, suggesting the dispute will heavily involve expert analysis of whether the patents' claims are novel and non-obvious Compl. ¶¶48-55
  • Scope Questions: The complaint repeatedly notes that the term "so-called drive mechanism" is "never defined" in the patents Compl. ¶42 Compl. ¶59 Compl. ¶70 This suggests a potential dispute over claim construction and a possible indefiniteness challenge, raising the question of whether the scope of "drive mechanism" is clear to a person of ordinary skill in the art.
  • Technical Questions: A key functional limitation in the independent claims of all three patents is the ability of the "quick-connect system" to allow insertion or removal of a massage head "while the piston reciprocates" '051 Patent, claim 1 The infringement analysis may turn on what evidence is presented to show whether the Accused Products are designed to, and can safely, perform this function as claimed.

V. Key Claim Terms for Construction

• The Term: "quick-connect system ... wherein the quick-connect system allows a proximal end of the first massaging head to be inserted into or removed from the bore while the piston reciprocates"

• Context and Importance: This limitation appears in the independent claims of all three asserted patents and describes a core functional feature. Its construction is critical because infringement will depend on whether the Accused Products "allow" for this "hot-swapping" of massage heads during operation, and what the term "allows" legally and technically requires.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The specification states that the "exemplary quick-connect system 600 may be used without turning off the massaging device 100" '051 Patent, col. 6:55-56 This language focuses on the functional capability of the system, which may support an interpretation not limited to a specific structure.
  • Evidence for a Narrower Interpretation: The detailed description discloses a specific embodiment of the quick-connect system that uses magnets to hold the massage head in place '051 Patent, col. 6:57-67 '051 Patent, Figs. 6-6A A party could argue that the term should be construed as limited to this magnetic implementation or its equivalents, particularly if this feature was used to distinguish prior art during prosecution.

• The Term: "drive mechanism"

• Context and Importance: Practitioners may focus on this term because Plaintiffs explicitly assert it is "never defined" in the patents, creating a basis for an indefiniteness challenge Compl. ¶42 The definition of this term is fundamental to the structure of the claimed device.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The specification describes components that convert the motor's rotary motion into the piston's linear motion, including a flywheel, a crank pin, and a crank bearing, which collectively form a "Scotch yoke" mechanism '051 Patent, col. 4:52-5:16 A party could argue that "drive mechanism" would be understood by a person of ordinary skill in the art to encompass these interacting components that perform the driving function.
  • Evidence for a Narrower Interpretation: The lack of an explicit definition may be argued to render the term's boundaries unclear. Notably, claim 1 of the '826 Patent specifies that "the drive mechanism comprises a flywheel," which could be used to argue that for the '051 and '082 Patents, which lack this language in their independent claims, the term is ambiguous or should be construed differently.

VI. Other Allegations

• Indirect Infringement: As this is a declaratory judgment action, the Plaintiffs seek a judicial declaration that their sale of the Accused Products does not constitute contributory or induced patent infringement Compl. ¶88 Compl. ¶100 Compl. ¶112 The complaint does not detail any specific allegations of indirect infringement made by the Defendants.

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

• A core issue will be one of validity: can Defendants demonstrate that the combination of elements in the asserted claims, particularly the feature of swapping massage heads "while the piston reciprocates," was a non-obvious improvement over the crowded field of electric massagers that Plaintiffs allege existed for over a century?
• A key evidentiary question will be one of functional operation: does the evidence show that the Accused Products are designed to operate as claimed, specifically by allowing for the safe removal and insertion of a massage head while the device is actively running, or is this merely a theoretical capability not intended as a feature?
• A central legal question will be one of claim construction and definiteness: will the term "drive mechanism," which Plaintiffs identify as undefined, be construed by the court as having a clear meaning to a person of ordinary skill in the art based on the patent's specification, or will it be found fatally indefinite?