SharkNinja Operating LLC v. Zhejiang Baili Technology Co Ltd

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: SharkNinja Operating LLC and SharkNinja Sales Company (Delaware/Massachusetts)
  • Defendant: Zhejiang Baili Technology Co., Ltd. (China)
  • Plaintiff's Counsel: Shook, Hardy & Bacon LLP.
• Case Identification: 1:26-cv-11822, D. Mass., 04/20/2026
• Venue Allegations: Venue is asserted based on the defendant allegedly committing acts of infringement and transacting business in the district through fully interactive e-commerce storefronts accessible to Massachusetts consumers.
• Core Dispute: Plaintiff alleges that Defendant's Rosewill-branded portable air fryers infringe two design patents covering the ornamental appearance of Plaintiff's Ninja CRISPi product line.
• Technical Context: The dispute is situated in the competitive consumer market for kitchen appliances, where distinctive product design is a key differentiator.
• Key Procedural History: The complaint alleges Plaintiff provided constructive notice of the asserted patents via its public patent marking webpage, a fact that may become relevant to the calculation of damages.

Case Timeline

Date	Event
2021-08-01	Ninja CREAMi launched (approximate date)
2023-03-01	Ninja SPEEDi launched (approximate date)
2023-07-01	Ninja THIRSTi launched (approximate date)
2024-09-04	Priority Date for '567 and '472 Patents
2024-09-26	Ninja CRISPi launched
2025-11-04	'567 Patent issued
2025-11-05	Constructive notice of '567 Patent alleged to begin
2025-11-11	'472 Patent issued
2025-11-12	Constructive notice of '472 Patent alleged to begin
2026-04-20	Complaint Filing Date

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

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

The Invention Explained

• Problem Addressed: The complaint suggests an opportunity to innovate beyond traditional countertop air fryers that use fixed, drawer-style cooking baskets Compl. ¶14 The patent itself, as a design patent, does not articulate a problem but instead presents a new ornamental design.
• The Patented Solution: The patent claims the specific ornamental design for a removable air fryer pod Compl. ¶20 The design's overall visual impression is characterized by a two-tiered body with a contoured top handle/control area, a flared base, and distinct feet '567 Patent, figs. 1-2 The complaint links this design to a new product category that allows consumers to cook in a unique container using a removable top-down pod Compl. ¶14 Dashed lines in the patent figures indicate that elements like the power cord are not part of the claimed design '567 Patent, description
• Technical Importance: The design provides a distinct visual identity for a new type of portable air fryer, distinguishing it aesthetically from prior models in the market Compl. ¶14

Key Claims at a Glance

• Design patents contain a single claim for the ornamental design as shown in the drawings. The asserted claim is: "The ornamental design for an air fryer, as shown and described" '567 Patent, claim
• The claim covers the overall visual appearance of the air fryer pod as depicted in the solid lines of the patent's figures '567 Patent, figs. 1-8 Key visual features contributing to this appearance include the pod's two-tiered profile, the shape of the upper handle and control section, and the flared base.

U.S. Patent No. D1,101,472 - "Air Fryer"

The Invention Explained

• Problem Addressed: As with the '567 Patent, the goal is to establish a new ornamental design, in this case for an assembled air fryer system rather than a single component.
• The Patented Solution: The patent claims the ornamental design for an air fryer assembly, comprising the air fryer pod, a glass cooking container, and a size adapter between them Compl. ¶21 The claim protects the overall visual impression of these three components when assembled '472 Patent, fig. 1 The complaint asserts that this combined design "capture[s] the essence of the product" and its user-friendly functionality Compl. ¶22 The dashed lines disclaim portions of the design, such as the power cord and parts of the container handles '472 Patent, description
• Technical Importance: This design protects the holistic visual identity of the entire product in its operational state, which is a key aspect of its market presentation and differentiation from other appliances Compl. ¶22

Key Claims at a Glance

• The single asserted claim is: "The ornamental design for an air fryer, as shown and described" '472 Patent, claim
• The claim covers the overall ornamental appearance of the assembled air fryer pod, adapter ring, and cooking container, as shown in the solid-lined portions of the patent's figures '472 Patent, figs. 1-8 The visual relationship and proportions between the separate components are integral to the claimed design.

III. The Accused Instrumentality

Product Identification

The complaint identifies "Rosewill-branded air-fryer products," specifically model "RHAF-25001NB," as the Accused Products Compl. ¶25 Compl. ¶30 The packaging for this product describes it as a "Portable Glass Air Fryer" Compl. p. 8

Functionality and Market Context

The complaint alleges Defendant Zhejiang Baili Technology Co., Ltd. is involved in the manufacture of the Accused Products, which are sold in the U.S. through online marketplaces Compl. ¶4 Compl. ¶25 Compl. ¶28 The complaint characterizes the Accused Products as "inferior imitations" that bear a "striking resemblance to the Ninja CRISPi" and make "unauthorized use of the ornamental designs" claimed in the patents-in-suit Compl. ¶4 Compl. ¶30 The complaint provides a side-by-side photographic comparison of the accused Rosewill product and the plaintiff's Ninja CRISPi to illustrate the alleged resemblance Compl. ¶31

IV. Analysis of Infringement Allegations

The infringement test for a design patent is whether an "ordinary observer," familiar with the prior art, would be deceived into purchasing the accused device believing it to be the patented design. The complaint alleges infringement by presenting side-by-side visual comparisons.

D1,100,567 Infringement Allegations

Claim Element (from the Design as Shown)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
The overall ornamental appearance of a two-tiered air fryer pod with a flared base.	The accused Rosewill product is alleged to embody a substantially similar overall visual appearance and two-tiered profile.	¶37	'567 Patent, fig. 2
The specific shape and contours of the top handle and control surface area.	The top section of the accused Rosewill product is alleged to have a similar shape and configuration.	¶37	'567 Patent, fig. 1
The ornamental appearance of the flared base and distinct feet.	The base of the accused Rosewill product is alleged to be similarly flared with feet that create a comparable stance.	¶37	'567 Patent, fig. 2

D1,101,472 Infringement Allegations

Claim Element (from the Design as Shown)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
The overall ornamental appearance of the combined air fryer pod, adapter ring, and cooking container.	The accused Rosewill product, when assembled, is alleged to create an overall visual impression that is substantially the same as the patented design.	¶45	'472 Patent, fig. 1
The visual relationship and interface between the pod, the adapter ring, and the container.	The complaint's visual evidence suggests the accused product's components assemble in a way that allegedly creates a similar visual interplay and proportion.	¶45	'472 Patent, fig. 1

Identified Points of Contention

• Scope Questions: A central issue will be the scope of the patented designs in light of prior art. A defendant may argue that any similarities between the products relate to functional aspects of air fryers or to design elements common in the prior art, which would not be protected by the design patents. The dispute may focus on whether the overall visual impression of the patents is novel and distinctive enough to preclude similar, but not identical, designs.
• Design Detail Questions: The infringement analysis will likely involve a detailed comparison of the accused product's specific contours, proportions, and surface features against the patent drawings. The complaint provides visual comparisons to assert substantial similarity Compl. ¶37 Compl. ¶45 A defense would likely highlight every perceptible difference-such as variations in curvature, handle shape, or the precise design of the feet-to argue that an ordinary observer would not be deceived.

V. Key Claim Terms for Construction

In design patent litigation, formal claim construction of specific terms is uncommon. The "claim" is understood to be the design itself as depicted in the drawings. The analysis focuses on the overall visual appearance of the claimed design rather than the definition of words. However, the scope of the design as a whole is a critical issue that functions analogously to claim construction.

• The "Term": The "ornamental design for an air fryer" as a whole, as depicted in the solid lines of the patent figures.
• Context and Importance: The entire case hinges on the scope of this visual design. The court's interpretation of what constitutes the core, protected "look and feel" of the patents versus unprotected functional elements or minor details will determine whether the accused product infringes.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: A party could argue that the patents protect the novel overall visual concept of a top-down pod interacting with a glass bowl, as this configuration creates a new aesthetic paradigm for air fryers Compl. ¶14 Compl. ¶22 This view would suggest that minor deviations in form do not escape infringement if the overall impression is copied.
  • Evidence for a Narrower Interpretation: A party could argue the claim is limited to the exact ornamental features shown in the solid lines of the drawings '567 Patent, figs. 1-8 '472 Patent, figs. 1-8 The use of dashed lines to disclaim the power cord and other elements demonstrates a clear intent to limit the patent's scope to the specific surfaces and shapes depicted, suggesting that any deviation from those exact lines is significant '567 Patent, description '472 Patent, description

VI. Other Allegations

• Indirect Infringement: The complaint includes a general allegation of indirect infringement Compl. ¶3 However, the specific claims for relief (Counts I and II) are pleaded exclusively as direct infringement under 35 U.S.C. § 271(a) Compl. ¶35 Compl. ¶43 The complaint does not set forth specific factual allegations to support claims of induced or contributory infringement.
• Willful Infringement: The complaint does not explicitly use the word "willful." It alleges that the defendant has had knowledge of the patents, at a minimum, since the date the complaint was filed Compl. ¶38 Compl. ¶46 It also alleges constructive notice based on Plaintiff's public patent-marking website, effective since the day after each patent issued Compl. ¶38 Compl. ¶46 These allegations could potentially form the basis for a future claim of willful infringement and enhanced damages.

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

• Visual Deception: The central issue will be the application of the "ordinary observer" test. Will the trier of fact conclude that the overall ornamental appearance of the accused Rosewill air fryer is "substantially the same" as the designs in the '567 and '472 patents, such that an ordinary observer would be deceived? The case will turn on a direct visual comparison between the accused product and the patent drawings.
• The Role of Prior Art: A key battleground may be the scope of the patents. The defendant may introduce prior art designs to argue that the similarities between the products are common to the field, thereby narrowing the enforceable scope of Plaintiff's patents to their specific, precise details and potentially distinguishing the accused product.
• Component vs. Assembly Infringement: The assertion of two distinct patents raises a nuanced question. The court will need to separately analyze infringement of the '567 Patent (the pod alone) and the '472 Patent (the pod, adapter, and container assembly). It is possible to find infringement of one design but not the other, depending on how the visual appearance of the individual component compares to the appearance of the full assembly.