Shenzhen Ankou Technology Co Ltd v. Kaz Europe SARL

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Shenzhen Ankou Technology Co., Ltd. (China)
  • Defendant: Kaz Europe Sàrl (Switzerland)
  • Plaintiff's Counsel: Glacier Law LLP
• Case Identification: 2:26-cv-00800, W.D. Wash., 06/25/2026
• Venue Allegations: Plaintiff alleges venue is proper in the Western District of Washington because Defendant expressly consented to jurisdiction and venue in King County, Washington through an Amazon APEX Agreement, and because a substantial part of the events giving rise to the claim-namely, the enforcement action via Amazon's Seattle-based APEX program-occurred in the district.
• Core Dispute: Plaintiff seeks a declaratory judgment that its airtight food storage containers do not infringe Defendant's patent related to a push-button sealing mechanism and/or that the patent is invalid, following an infringement assertion made by the Defendant through Amazon's Patent Evaluation Express (APEX) program.
• Technical Context: The technology concerns mechanical systems for creating an airtight seal in consumer food storage containers, a mature market where ease of use and seal reliability are key features.
• Key Procedural History: The complaint highlights a significant history of prior litigation in China between the Plaintiff and Helen of Troy, an entity related to the Defendant, concerning a corresponding Chinese "sister patent." These proceedings allegedly resulted in a finding of non-infringement against the Plaintiff's products and a subsequent invalidation of the core claims of the Chinese patent, decisions which were ultimately affirmed by the Supreme People's Court of China. The complaint alleges the U.S. patent was assigned to the current Defendant after these rulings.

Case Timeline

Date	Event
2006-03-31	'067 Patent Priority Date
2010-10-19	'067 Patent Issue Date
2018-01-23	Chinese Patent Reexamination Board issues decision invalidating claims of related Chinese patent
2020-10-19	Supreme People's Court of China affirms invalidation of related Chinese patent
2025-02-28	Purported effective date of '067 Patent assignment from Helen of Troy to Kaz Europe Sàrl
2026-02-02	Defendant executes patent-owner portion of Amazon APEX Agreement
2026-02-04	Plaintiff receives notice of infringement assertion via Amazon APEX process
2026-02-22	Plaintiff executes seller portion of APEX Agreement
2026-06-25	First Amended Complaint for Declaratory Judgment filed

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

U.S. Patent No. 7,815,067 - "Container with Sealable Lid"

• Patent Identification: U.S. Patent No. 7,815,067, "Container with Sealable Lid", issued October 19, 2010 (the "'067 Patent").

The Invention Explained

• Problem Addressed: The patent's background describes conventional container lids, such as snap-fit or friction-fit types, as being difficult to secure and remove. ʼ067 Patent, col. 1:11-14 It also notes that lids with latches can fail if the latches break, potentially requiring replacement of the entire container. ʼ067 Patent, col. 1:16-20
• The Patented Solution: The invention is a lid with a central "push-push" button that operates a sealing mechanism. ʼ067 Patent, col. 3:19-24 A first push on the button engages a "toggle mechanism," which shifts a seal from an "uncompressed" state to a "compressed" state, causing it to expand and seal against the inner wall of the container. ʼ067 Patent, abstract ʼ067 Patent, col. 8:12-19 A second push on the same button reverses the toggle mechanism, releasing the compression on the seal and allowing for easy removal of the lid. ʼ067 Patent, col. 8:26-41 The specification discloses embodiments where this toggle mechanism is a pin that follows a heart-shaped cam path. ʼ067 Patent, col. 2:54-59
• Technical Importance: The design aims to provide a reliable, one-handed sealing operation that is easy to both engage and disengage, improving upon the usability of prior art lids. ʼ067 Patent, col. 2:60-65

Key Claims at a Glance

• The complaint states that Defendant asserted independent claim 1 in the APEX proceeding. Compl. ¶11 Compl. ¶45
• The essential elements of independent claim 1 are:
  • a housing defining a receptacle;
  • a cover disposable on the housing;
  • a push-push type button movably carried by the cover;
  • a seal carried by the cover and shiftable between a compressed condition for sealingly engaging the wall structure and an uncompressed condition for disengaging from the wall structure; and
  • a toggle mechanism coupled to the button and the seal for effecting movement of the seal between those conditions in response to alternate actuations of the button.
• The complaint notes that because the independent claims are not infringed, the dependent claims are also not infringed, and reserves the right to address all claims. Compl. ¶53

III. The Accused Instrumentality

Product Identification

• The complaint identifies the accused products as Plaintiff's "Containers with Lids Airtight," sold on Amazon under various ASINs, including B0CGV66W52 and B0B7WYBYR7, among others. Compl. ¶23

Functionality and Market Context

• The complaint describes the accused products as food-storage containers sold through e-commerce channels, with Amazon being a "primary sales channel" for the Plaintiff in the United States. Compl. ¶22 Compl. ¶32
• Plaintiff alleges its products employ a "fundamentally different sealing mechanism" from that claimed in the ʼ067 Patent. Compl. ¶47
• According to the complaint, the accused products use a "dome-shaped or dished sealing ring that moves radially outward" to contact the container wall, rather than a seal that is itself compressed. Compl. ¶47 Sealing is allegedly achieved through "radial displacement and positional engagement," not "compression and decompression of the seal itself." Compl. ¶¶47-48
• The complaint further alleges the internal mechanism is a "rotary ratchet indexing mechanism" that converts vertical button movement into rotational motion, which is asserted to be fundamentally different from the cam-based "toggle mechanism" described in the ʼ067 Patent. Compl. ¶50

No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint seeks a declaratory judgment of non-infringement. The analysis below summarizes the Plaintiff's non-infringement arguments as presented in the complaint.

'067 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Non-Infringing Functionality	Complaint Citation	Patent Citation
a seal carried by said cover and shiftable between a compressed condition... and an uncompressed condition	The accused products' seal does not transition between compressed and uncompressed states; instead, a sealing ring is repositioned radially to engage the container wall. Sealing occurs via positional engagement, not material compression of the seal itself.	¶¶46-48	col. 2:38-44
a toggle mechanism coupled to said button and to said seal for effecting movement of the seal... in response to alternate actuations of said button	The accused products do not contain a "toggle mechanism." They instead use a "rotary ratchet indexing mechanism" that converts vertical button movement into rotational indexing, which is alleged to be structurally and functionally different from the cam-based toggle mechanisms disclosed in the patent.	¶¶49-50	col. 4:65-6:64

• Identified Points of Contention:
  • Scope Question: The dispute raises the question of whether the accused product's mechanism, which allegedly achieves a seal by radially repositioning a sealing ring, falls within the scope of a seal that is "shiftable between a compressed condition and an uncompressed condition." The Plaintiff's position suggests a distinction between material compression and positional engagement. Compl. ¶47
  • Technical & Legal Question: A central point of contention appears to be the "toggle mechanism." The complaint argues this is a means-plus-function term under 35 U.S.C. § 112(f), limiting its scope to the structures disclosed in the patent (e.g., heart-shaped cams) and their structural equivalents. Compl. ¶49 This raises the question of whether the accused "rotary ratchet indexing mechanism" is structurally equivalent to the patent's disclosed embodiments. Compl. ¶50

V. Key Claim Terms for Construction

• The Term: "shiftable between a compressed condition ... and an uncompressed condition"
  • Context and Importance: This term is critical because Plaintiff alleges its seal does not compress but is merely repositioned radially. Compl. ¶47 The definition of "compressed condition" will determine whether it requires a change in the physical state of the seal material itself or can broadly cover any state in which the seal is under pressure to form an engagement.
  • Intrinsic Evidence for a Broader Interpretation: The patent's objective is to "form a seal." ʼ067 Patent, col. 3:22 A party could argue that any condition that results in a functional seal against the container wall is, by definition, a "compressed condition" in the context of the invention.
  • Intrinsic Evidence for a Narrower Interpretation: The detailed description states that the movement of lid components "compresses the seal 108," which in turn causes it to "expand outwardly and engage" the container wall. ʼ067 Patent, col. 8:12-19 This language may support an interpretation that requires the material of the seal itself to be compressed as the cause of the outward expansion.
• The Term: "toggle mechanism"
  • Context and Importance: Plaintiff argues this term should be construed under 35 U.S.C. § 112(f) as a means-plus-function limitation. Compl. ¶49 If successful, this would limit the claim's scope to the specific structures disclosed in the specification and their equivalents, making it more difficult to prove infringement by the accused "rotary ratchet" device. Compl. ¶50 Practitioners may focus on this term because its construction could be dispositive of the infringement question.
  • Intrinsic Evidence for a Broader Interpretation (Non-Means-Plus-Function): A party may argue that "toggle mechanism" is a well-understood structural term in mechanical arts, connoting a device that switches between two stable states, and therefore is not subject to means-plus-function treatment.
  • Evidence for a Narrower Interpretation (Means-Plus-Function): The claim language "mechanism... for effecting movement" is a classic formulation that suggests intent to invoke § 112(f). The specification provides corresponding structures, such as a "latch having two sides... defining heart-shaped cam surfaces" ('067 Patent, col. 2:54-59) and a slider-and-guide assembly. ʼ067 Patent, col. 9:19-44 This evidence may support limiting the term to these structures and their equivalents.

VI. Other Allegations

• Declaratory Judgment of Invalidity:
  • The complaint includes a second count seeking a declaratory judgment that one or more claims of the '067 Patent are invalid under 35 U.S.C. §§ 102 (anticipation), 103 (obviousness), and/or 112 (enablement/written description). Compl. ¶62 Compl. ¶73
  • As an exemplary basis for this claim, the complaint identifies several prior art references. Compl. ¶¶63-70 For instance, it alleges U.S. Patent No. 6,869,114 to Ueki teaches a push-push mechanism utilizing "generally heart-shaped cam grooves," attacking the novelty of the claimed toggle mechanism. Compl. ¶65
  • It also cites U.S. Patent No. 3,750,822 to Dubach, which allegedly "expressly teaches that the sealing member is compressed in an axial direction to expand radially," raising questions about the novelty of the claimed seal compression function. Compl. ¶63

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

This declaratory judgment action presents several distinct questions for the court's determination:

• A primary issue will be one of claim construction and technical equivalence: Is the term "toggle mechanism" a means-plus-function limitation, and if so, is the accused product's "rotary ratchet indexing mechanism" a structural equivalent to the cam-based structures disclosed in the '067 Patent? This analysis will likely be central to the infringement dispute.
• A second core question is one of functional scope: Does the accused product's method of achieving a seal via radial repositioning of a sealing ring fall within the scope of a claim requiring a seal that is "shiftable between a compressed condition and an uncompressed condition"? This may turn on whether "compression" is defined by the state of the material or the function it performs.
• Finally, the case presents a significant validity challenge: Do the numerous prior art references cited by the Plaintiff, which allegedly disclose key elements such as push-push actuators with heart-shaped cams and axially compressed radial seals, anticipate or render obvious the claims of the '067 Patent?