CAO Group Inc v. Grof

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: CAO GROUP, INC. (Utah)
  • Defendant: Martin Grof (Slovak Republic); Enjoy Life S.R.O. (Slovak Republic)
  • Plaintiff's Counsel: Law Office of Nicholas S. Lee
• Case Identification: 1:26-cv-06410, N.D. Ill., 06/01/2026
• Venue Allegations: Venue is alleged to be proper because the defendants are not residents of the United States and may be sued in any judicial district. It is further alleged that a substantial part of the events giving rise to the claims, including importation and sales through Amazon.com, occurred in the Northern District of Illinois.
• Core Dispute: Plaintiff alleges that Defendants' teeth whitening strip products, sold online, infringe a patent related to peroxide gel compositions for dental applications.
• Technical Context: The technology relates to chemical compositions for consumer dental whitening products, specifically gels designed to be stable, adhesive, and flexible for application via a strip.
• Key Procedural History: The complaint notes that the patent-in-suit was issued on November 28, 2023, and has since expired. The lawsuit seeks only monetary damages for past infringement that occurred during the patent's term.

Case Timeline

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

U.S. Patent No. 11,826,444 - "Peroxide Gel Compositions"

• Patent Identification: U.S. Patent No. 11,826,444, "Peroxide Gel Compositions", issued November 28, 2023.

• The Invention Explained:

  • Problem Addressed: The patent's background describes issues with prior art dental whitening products. Liquid treatments in trays are messy, run off the teeth, and are diluted by saliva '444 Patent, col. 2:18-28 Existing polymers used to create gels were often unstable when mixed with high concentrations of hydrogen peroxide, limiting whitening efficacy, and rigid compositions were prone to cracking or breaking when flexed '444 Patent, col. 2:9-16 '444 Patent, col. 3:9-12
  • The Patented Solution: The invention describes a dental whitening device using a specific type of gel composition that is "gelatinous, non-coalescent, [and] visco-elastic" '444 Patent, abstract This composition is created using a thickener-either polyethyloxazoline or polyvinylpyrrolidone (PVP)-that is compatible with high concentrations of peroxide '444 Patent, col. 10:9-12 When applied to a flexible backing strip and dried, the composition forms a conformable, adhesive layer that can be applied to a user's dental arch, flexing to fit without cracking '444 Patent, col. 8:25-30
  • Technical Importance: The invention claims to provide a shelf-stable, high-concentration peroxide gel that can be delivered via a flexible strip, aiming to combine user convenience with improved whitening performance compared to messy trays or less stable gel formulations '444 Patent, col. 6:35-44

• Key Claims at a Glance:

  • The complaint asserts infringement of at least independent Claim 1 Compl. ¶28
  • The essential elements of Claim 1 are:
    • A dental whitening device comprising:
    • A flexible, planar strip of backing material with two flat sides;
    • A "gelatinous, non-coalescent, visco-elastic" dental composition on at least one flat side of the strip;
    • The composition includes a tooth whitening agent, a solvent, and a specific thickening agent "selected from the set of thickening agents consisting of polyethyloxazoline and polyvinylpyrrolidone (PVP)";
    • When adhered to a dental arch, both the composition and backing material "flex and conform to the user's dental arch without cracking or breaking."
  • The complaint reserves the right to assert additional claims Compl. ¶29

III. The Accused Instrumentality

• Product Identification: The "Bright White Teeth Whitening Strips" sold on Amazon.com under the seller names "Ray of Smile" and "Lovely Smile" Compl. ¶6 Compl. ¶17
• Functionality and Market Context: The accused products are consumer teeth whitening strips sold online to U.S. consumers, including those in Illinois Compl. ¶3 Compl. ¶18 The complaint alleges that the product packaging claims "No Slip Technology" Compl. ¶19 A central piece of evidence cited is the product's ingredient list, which is disclosed on the Amazon.com listing and packaging Compl. ¶20 This ingredient list allegedly includes "PVP" (polyvinylpyrrolidone) and "Hydrogen Peroxide," which the complaint maps directly to elements of the asserted patent claim Compl. ¶20 Compl. ¶31 Compl. ¶33 The complaint provides a screenshot of the Amazon.com listing as evidence of the product and its ingredients Compl. ¶17

IV. Analysis of Infringement Allegations

'444 Patent Infringement Allegations

• Identified Points of Contention:
  • Factual Question: The complaint's allegation that the accused product's gel is "gelatinous, non-coalescent, [and] visco-elastic" is based on "information and belief" and "inspection of an actual sample" Compl. ¶34 A central dispute may be whether the physical properties of the accused gel meet this multi-part definition as it is defined in the patent specification.
  • Scope Question: Claim 1 requires "a thickening agent selected from the set of thickening agents consisting of... PVP." The accused product's ingredient list includes PVP, but also "Hydroxypropyl Methylcellulose," another thickening agent Compl. ¶20 This raises the question of whether the presence of an additional, un-claimed thickener impacts the infringement analysis of a claim limitation structured with "consisting of" language for the set of options.

V. Key Claim Terms for Construction

• The Term: "gelatinous, non-coalescent, visco-elastic"
• Context and Importance: This compound term defines the core physical characteristics of the patented composition. The outcome of the case may depend on whether the accused product's gel, which contains multiple thickening agents, can be proven to exhibit these specific properties.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification provides a dictionary-style definition for "gelatinous" as "resembling gelatin, viscous" and defines the term generally as a compound having properties between a solid and a fluid '444 Patent, col. 5:54-61
  • Evidence for a Narrower Interpretation: The patent offers a specific functional test for "non-coalescent," stating that if discrete units are placed in a container, "they will bend as they contact the container but will not merge into one body" '444 Patent, col. 6:1-7 It also likens the consistency to that of "gummi worms," a specific commercial confection '444 Patent, col. 8:26-28

VI. Other Allegations

• Indirect Infringement: The complaint alleges infringement based on the product's application instructions, which may support a claim for induced infringement by instructing users to perform the claimed final step of adhering the device to a dental arch Compl. ¶35
• Willful Infringement: The complaint alleges willful infringement based on the theory that the defendants, as "foreign online sellers," knew or should have known their actions constituted infringement and took "no adequate steps to ascertain or respect the patent" Compl. ¶24 Compl. ¶38 The claim is based on alleged objective recklessness rather than specific pre-suit notice.

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

This dispute over an expired patent for past damages appears to center on a straightforward product-to-claim comparison. The key questions for the case are likely to be:

• An evidentiary question of physical properties: Will discovery and expert testing demonstrate that the accused "Bright White" strips, which contain both PVP and another thickener, actually possess the specific "gelatinous, non-coalescent, visco-elastic" properties as defined in the '444 Patent specification?
• A functional performance question: Does the accused product, in practice, "flex and conform to the user's dental arch without cracking or breaking" as required by the final limitation of Claim 1, and what evidence will be required to prove or disprove this functional outcome?
• A damages question: Given that the patent was only in force for a limited period (November 2023 until its expiration), the case will turn on quantifying the appropriate "reasonable royalty" damages for sales of the accused product during that specific timeframe.