Shenzhen Ankou Technology Co Ltd v. Kaz Europe SRL

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., 03/09/2026
• Venue Allegations: Plaintiff alleges venue is proper in the Western District of Washington because Defendant's assertion of patent infringement was made through Amazon's Patent Evaluation Express (APEX) process, which is directed to Amazon in Seattle. Additionally, the complaint alleges that Defendant expressly consented to venue in King County, Washington, as part of the APEX Agreement.
• Core Dispute: Plaintiff seeks a declaratory judgment that its airtight food storage containers do not infringe U.S. Patent No. 7,815,067, and/or that the patent is invalid, following Defendant's assertion of the patent through Amazon's APEX program.
• Technical Context: The technology relates to mechanical sealing mechanisms for food storage containers, specifically lids that employ a push-button actuator to create or release an airtight seal with the container body.
• Key Procedural History: The complaint alleges that Defendant's assertion of the patent follows a related dispute in China between Plaintiff and Helen of Troy Limited, an entity related to Defendant. In that dispute, a Chinese court found that Plaintiff's products did not infringe a corresponding Chinese patent. Subsequently, a Chinese patent authority invalidated a majority of the claims of that same Chinese patent, a decision that was ultimately affirmed by the Supreme People's Court of the People's Republic of China. The complaint notes that the U.S. patent was assigned from Helen of Troy to the current Defendant after these adverse foreign rulings.

Case Timeline

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 section describes conventional container lids, such as snap-fit or friction-fit types, as being difficult to secure and remove. Other lids that use latches are identified as being susceptible to breakage ʼ067 Patent, col. 1:5-18
• The Patented Solution: The invention is a storage container with a lid that creates a seal via a "push-push operation" ʼ067 Patent, col. 3:11-13 A user presses a button on the lid, which actuates a "toggle mechanism." An initial push engages the mechanism to move a seal into a "compressed condition," thereby sealing the container against its wall structure. A subsequent push disengages the mechanism, allowing the seal to return to an "uncompressed condition" and release the lid ʼ067 Patent, abstract ʼ067 Patent, col. 4:62-67 The detailed description discloses mechanisms for achieving this, including one using a pin that follows heart-shaped cam surfaces ʼ067 Patent, col. 2:44-51
• Technical Importance: This approach allows a user to seal and unseal the container easily, often with one hand, which improves convenience over prior art lids that required more effort or dexterity ʼ067 Patent, col. 2:64-67

Key Claims at a Glance

• The complaint focuses its non-infringement arguments on independent claim 1 Compl. ¶19 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 (1, 12, and 17) are not infringed, any dependent claims are also not infringed Compl. ¶53

III. The Accused Instrumentality

Product Identification

• The accused products are Plaintiff's "Containers with Lids Airtight," which are identified in the complaint by a list of ten distinct Amazon Standard Identification Numbers (ASINs) Compl. ¶24 Compl. ¶32

Functionality and Market Context

• The complaint alleges that the accused products employ a "fundamentally different sealing mechanism" from that claimed in the '067 Patent Compl. ¶47 Instead of compressing a seal, the accused products allegedly use a "dome-shaped or dished sealing ring that moves radially outward to bring a sealing pad into contact with the inner wall of the container" Compl. ¶47 The complaint characterizes this as a repositioning of the seal rather than a transition between compressed and uncompressed material states Compl. ¶48
• The complaint states that Amazon is a "primary sales channel for Plaintiff in the United States" and that the threatened removal of its product listings would cause "immediate and ongoing commercial harm" Compl. ¶22 Compl. ¶23
• No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

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

• '067 Patent Infringement Allegations

• Identified Points of Contention:
  • Scope Questions: A central dispute will be the proper construction of the phrase "shiftable between a compressed condition... and an uncompressed condition." The case may turn on whether this language requires a physical compression of the seal material itself, as Plaintiff contends Compl. ¶47, or whether it can be construed more broadly to cover a state where the seal is merely pressed firmly against the container wall.
  • Technical Questions: The complaint raises the question of whether the accused "rotary ratchet indexing mechanism" falls within the scope of the claim term "toggle mechanism" Compl. ¶49 Compl. ¶50 This dispute may involve a determination of whether "toggle mechanism" is a means-plus-function term under 35 U.S.C. § 112(f), which would limit its scope to the specific structures disclosed in the patent and their structural equivalents Compl. ¶49

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's primary non-infringement argument is that its accused seal is repositioned radially, not compressed Compl. ¶48 The interpretation of "compressed condition" will directly impact whether the accused functionality meets this claim limitation.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The patent's abstract links the "compressed condition" directly to its function: "a compressed condition for sealingly engaging the wall structure" ʼ067 Patent, abstract A party could argue this suggests that any state that achieves sealing engagement is a "compressed condition" under the claim.
  • Evidence for a Narrower Interpretation: The detailed description states that the "movement of the bottom member 120 towards the top member 158 compresses the seal 108 between the top and bottom members" ʼ067 Patent, col. 8:12-15 This language may support an interpretation that requires an actual physical squeezing or reduction in volume of the seal material itself.

• The Term: "toggle mechanism"

• Context and Importance: Plaintiff alleges that this term should be construed as a means-plus-function limitation under 35 U.S.C. § 112(f) and that its "rotary ratchet indexing mechanism" is not a structural equivalent to the embodiments disclosed in the patent Compl. ¶¶49-50 Whether this term is subject to § 112(f) will be a pivotal issue.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation (Not Means-Plus-Function): A party may argue that "toggle mechanism" is a well-understood term of art for a mechanical device that alternates between two stable states and thus has a sufficiently definite structure to a person of ordinary skill, precluding means-plus-function treatment.
  • Evidence for a Narrower Interpretation (Means-Plus-Function): The complaint argues the term recites a function-"effecting movement of the seal"-without reciting "a sufficiently definite structural arrangement for performing that function" Compl. ¶49 If the court agrees, the term's scope would be limited to the structures disclosed in the specification, such as the latch with "heart-shaped cam surfaces" ʼ067 Patent, col. 2:44-51 or the slider-and-guide assembly ʼ067 Patent, col. 9:18-24, and their equivalents.

VI. Other Allegations

• Bad Faith / Exceptional Case Allegations: The complaint does not include a claim for willful infringement, as it was filed by the accused infringer. However, it makes several allegations regarding the Defendant's conduct. It alleges that the patent assertion was made in "bad faith" and "without a reasonable pre-suit investigation" Compl. ¶57 The basis for this allegation is the Defendant's and its related entities' alleged "actual knowledge" of prior court and administrative rulings in China that found non-infringement and invalidity with respect to a corresponding Chinese patent asserted against the same products Compl. ¶57 These allegations may be intended to support a future motion for attorneys' fees under 35 U.S.C. § 285, which allows for such an award in "exceptional cases."

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

• A core issue will be one of definitional scope: can the claim phrase "compressed condition," which is described in the patent specification in the context of squeezing a seal between two plates, be construed to cover the accused products' mechanism that allegedly achieves a seal by repositioning a sealing ring radially outward?
• A second key issue will be one of structural interpretation: is the term "toggle mechanism" a means-plus-function term under 35 U.S.C. § 112(f)? If so, the central technical question will be whether the accused "rotary ratchet indexing mechanism" is a structural equivalent of the cam-and-follower systems disclosed in the ʼ067 Patent.
• Finally, a significant procedural question will be the impact of foreign litigation: what weight, if any, will the court give to the extensive litigation history in China involving a corresponding patent, particularly the findings of non-infringement and invalidity? While not binding, these facts will likely frame the dispute over whether the defendant's patent assertion was objectively reasonable, which is relevant to the plaintiff's bad faith allegations and potential request for an exceptional case finding.