DCT

1:26-cv-12113

SharkNinja Operating LLC v. Dalianshi Sijin Dianzishangwu Youxiangongsi

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 1:26-cv-12113, D. Mass., 05/08/2026
  • Venue Allegations: Plaintiff alleges venue is proper in the District of Massachusetts because Defendant committed acts of infringement in the district and transacts business there through fully interactive e-commerce storefronts accessible to Massachusetts consumers.
  • Core Dispute: Plaintiff alleges that Defendant's Airmsen-branded air fryers infringe a design patent and a utility patent related to Plaintiff's Ninja CRISPi line of portable air fryers.
  • Technical Context: The technology relates to countertop air fryers featuring a removable top-mounted heating and fan "pod" that operates with a separate glass cooking and serving vessel.
  • Key Procedural History: The complaint alleges that Plaintiff has provided constructive notice of the patents-in-suit via its public patent-marking webpage and product packaging.

Case Timeline

Date Event
2023-08-01 '739 Patent Priority Date
2024-09-04 '567 Patent Priority Date
2024-09-12 '739 Patent Application Filing Date
2024-09-26 Plaintiff's Ninja CRISPi Product Launch
2025-09-30 '739 Patent Issue Date
2025-11-04 '567 Patent Issue Date
2025-11-05 Alleged Constructive Notice of '567 Patent
2025-11-12 Alleged Constructive Notice of '739 Patent
2026-05-08 Complaint Filing Date

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

U.S. Design Patent No. D1,100,567 - Air Fryer

  • Patent Identification: U.S. Patent No. D1,100,567, titled "Air Fryer," issued on November 4, 2025. Compl. ¶31
  • The Invention Explained:
    • Problem Addressed: Design patents protect ornamental appearance, not functional solutions to technical problems. The patent does not describe a problem.
    • The Patented Solution: The patent claims the specific ornamental design for a removable air-fryer pod. Key visual features include the overall two-tiered shape, the upper cylindrical portion with a top-mounted interface, and the wider, squared-off lower body with integrated handles and a protruding power cord, as shown in the patent's figures. Compl. ¶20 '567 Patent, FIG. 1
    • Technical Importance: The design provides a distinct visual identity for a new category of portable air fryer, where the heating element is a self-contained, removable pod rather than being integrated into a large, fixed housing. Compl. ¶14
  • Key Claims at a Glance:
    • As is typical for design patents, there is a single claim for "The ornamental design for an air fryer, as shown and described." '567 Patent, Claim

U.S. Patent No. 12,426,739 - Cooking devices and components thereof

  • Patent Identification: U.S. Patent No. 12,426,739, titled "Cooking devices and components thereof," issued on September 30, 2025. Compl. ¶39
  • The Invention Explained:
    • Problem Addressed: The patent's background describes traditional air fryers that use a cooking drawer, implying that this design is inconvenient as the cooking container is not easily used for serving or storage. '739 Patent, col. 1:31-44
    • The Patented Solution: The patent discloses a cooking system comprising a removable heating device and a separate vessel assembly. The asserted claim focuses on a vessel assembly that includes a handlebar positioned under the cooking vessel and extending upward. A key feature is a "gap" between the vessel wall and the handlebar that is "configured to be a thermal break," intended to keep the handle cool and safe for the user to touch while the vessel is hot. '739 Patent, col. 41:12-23 Compl. ¶21 This allows a single vessel to be used for cooking, serving, and storage. '739 Patent, col. 2:6-14
    • Technical Importance: This configuration aims to improve user convenience and safety by integrating a thermal insulation feature directly into the handle structure of a multi-purpose cooking vessel. Compl. ¶21
  • Key Claims at a Glance:
    • The complaint asserts independent claim 7. Compl. ¶42
    • The essential elements of independent claim 7 are:
      • a vessel, comprising a cavity configured to receive a food product therein;
      • an opening positioned in a wall of the vessel and configured for accessing the cavity;
      • a handlebar positioned under the vessel and configured to be contacted by a user, the handlebar extending upward along a portion of a height of the vessel; and
      • a gap positioned between the wall of the vessel and the handlebar, the gap configured to be a thermal break between the vessel and the handlebar. Compl. ¶43
    • The complaint reserves the right to assert other claims, and notes that the accused products also infringe claims 1 and 14. Compl. ¶49

III. The Accused Instrumentality

  • Product Identification: The accused products are the "Airmsen-branded air-fryer products," specifically identified as a "Glass Air Fryer with a 6.3 QT vessel" and a "Glass Air Fryer with 4.8 QT and 1.3 QT vessels" (the "Accused Products"). Compl. ¶27
  • Functionality and Market Context:
    • The complaint alleges the Accused Products are "obvious knock-off[s]" that copy the form and function of Plaintiff's Ninja CRISPi product. Compl. ¶42 They consist of a glass cooking vessel and a removable air-fryer pod that sits on top. Compl. ¶27 The complaint specifically alleges the products include a handlebar structure and touts a "Stay-Cool handle and heat-insulated base" feature, which is the basis for the infringement allegation of the '739 patent's "thermal break" limitation. Compl. ¶47
    • The products are allegedly sold in the U.S. through "fully interactive e-commerce marketplaces," with the complaint identifying the "SieGen-US storefront on Amazon.com" as being operated by the Defendant. Compl. ¶4 Compl. ¶25

IV. Analysis of Infringement Allegations

The infringement theory for the '567 design patent is based on the "ordinary observer" test, which assesses whether the accused design is substantially the same as the patented design such that an ordinary observer would be deceived into purchasing the accused product, believing it to be the patented one. The complaint alleges that the Accused Products "bear a substantially similar overall ornamental appearance to the design claimed in the '567 Patent." Compl. ¶35 A side-by-side comparison provided in the complaint shows the patented design figure next to a photograph of an accused Airmsen product. Compl. ¶35

'739 Patent Infringement Allegations

Claim Element (from Independent Claim 7) Alleged Infringing Functionality Complaint Citation Patent Citation
a vessel, comprising a cavity configured to receive a food product therein The Accused Products include a glass cooking vessel with an internal volume meant to receive food. ¶44 col. 2:15-17
an opening positioned in a wall of the vessel and configured for accessing the cavity The Accused Products' glass vessels have an opening in the upper wall for accessing the interior cavity. ¶45 col. 2:17-19
a handlebar positioned under the vessel and configured to be contacted by a user, the handlebar extending upward along a portion of a height of the vessel The Accused Products include a black plastic base part underneath the glass vessel that extends up along the sides to form a handlebar configured to be held by a user. ¶46 col. 41:16-19
a gap positioned between the wall of the vessel and the handlebar, the gap configured to be a thermal break between the vessel and the handlebar. The Accused Products are alleged to have a visible gap between the glass vessel and the plastic handlebar, and the product description touts a "Stay-Cool handle and heat-insulated base" to protect users from heat. ¶47 col. 41:20-23
  • Identified Points of Contention:
    • Scope Questions (Design Patent): The infringement analysis will turn on a factual comparison. A key question is whether an ordinary observer would find the overall visual impression of the Accused Products to be substantially the same as the '567 patent's design, considering any minor differences in shape, proportion, or surface ornamentation.
    • Technical Questions (Utility Patent): The primary technical question will be whether the accused "Stay-Cool handle and heat-insulated base" performs the function of a "thermal break" in the manner required by the claim. The complaint's evidence is a marketing statement, which raises the question of whether the accused product's physical structure actually creates the claimed "gap configured to be a thermal break" or if its "stay-cool" property results from a different, unclaimed mechanism (e.g., material choice alone).

V. Key Claim Terms for Construction

'739 Patent

  • The Term: "handlebar"

  • Context and Importance: Claim 7 requires the handlebar to be "positioned under the vessel" and "extending upward along a portion of a height of the vessel." The definition of this term is critical because if the accused product's handle is not found to meet this specific structural and positional configuration, there can be no infringement. Practitioners may focus on this term because the patent shows the handlebar as part of a distinct base component, whereas the accused product's handle appears integrated with the vessel.

  • Intrinsic Evidence for Interpretation:

    • Evidence for a Broader Interpretation: The specification uses the term "handle" generally to refer to a feature for lifting a device. '739 Patent, col. 10:33-34 This could support an argument that any structure that allows a user to hold the vessel qualifies.
    • Evidence for a Narrower Interpretation: Embodiments show the "handlebar" (1616a) as the upper part of a larger U-shaped base structure (250/1640a) that sits under and cradles the vessel. '739 Patent, FIG. 12A This may support an argument that "handlebar" is limited to a structure that is part of a separate base, not one directly molded to the vessel.

  • The Term: "thermal break"

  • Context and Importance: This functional limitation is central to the patent's purported safety innovation. Infringement hinges on whether the accused product's "Stay-Cool" feature is achieved by a "gap configured to be a thermal break."

  • Intrinsic Evidence for Interpretation:

    • Evidence for a Broader Interpretation: The claim language itself is functional: "the gap configured to be a thermal break." '739 Patent, col. 41:22-23 Plaintiff may argue that any gap that successfully insulates the handle from the vessel's heat meets this limitation, regardless of the precise geometry. The specification also refers more generally to an "insulating air gap." '739 Patent, col. 12:12-13
    • Evidence for a Narrower Interpretation: The specification describes the thermal break in a specific structural context: "a gap positioned between the connector plate and the support arm, the gap configured to be a thermal break between the connector plate and the handlebar." '739 Patent, col. 12:8-12 A defendant may argue that the term "thermal break" is not just any air gap, but one that arises from this specific arrangement of components, which may not be present in the accused device.

VI. Other Allegations

  • Indirect Infringement: The complaint includes a general allegation that Defendant "indirectly imports, develops, designs, manufactures, distributes, markets, offers for sale, and sells products that infringe," but it does not plead specific facts to support the knowledge and intent required for a claim of induced infringement, nor does it identify any non-staple components for a contributory infringement claim. Compl. ¶3
  • Willful Infringement: The complaint does not contain a separate count for willful infringement. It alleges knowledge of the patents, at a minimum, from the filing date of the complaint and also alleges constructive notice through Plaintiff's patent marking activities beginning in November 2025. Compl. ¶36 Compl. ¶50

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

  1. A question of visual identity: For the '567 design patent, is the overall ornamental appearance of the Airmsen air-fryer pod substantially the same as the patented design in the eyes of an ordinary observer, or are the differences in form and detail sufficient to distinguish them?

  2. A question of structural and functional equivalence: For the '739 utility patent, does the accused product's "Stay-Cool handle" and "heat-insulated base" rely on the specific claimed structure of a "handlebar positioned under the vessel" with a "gap configured to be a thermal break," or does it achieve a similar result through a different, unclaimed technical approach?

  3. A question of claim scope: The court's construction of the terms "handlebar" and "thermal break" will be dispositive. A central issue is whether these terms are limited to the specific base-and-handle structures shown in the patent's embodiments or can be read more broadly to cover any handle assembly that provides thermal insulation.

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