US 11,826,444 Peroxide gel compositions
3 defendants · 4 suits · updated October 16, 2026
Also cited as U.S. Patent No. 11,826,444 · US11826444B2 · US 11,826,444 B2 · 11826444 · the '444 patent
CAO Group, Inc. has filed 4 patent-infringement suits on US 11,826,444, "Peroxide gel compositions" since June 1, 2026, all in the N.D. Ill., against 3 distinct defendants including Martin Grof, Wencan Zhu and HISMILE PTY LTD.. The patent was granted November 28, 2023 on a priority date of February 8, 2006. Its abstract opens: "The present invention is a formable dental treatment tray utilizing poly(2-ethyl-2-oxazoline) and a gelatinous active." The examiner cited 2 references during prosecution.
- Assignee
- Cao Group Inc
- Priority date
- February 8, 2006
- Granted
- November 28, 2023
- Expires
- February 8, 2026
- Status
- Expired - Lifetime
- Claims
- 6 (3 independent)
- Inventors
- Steven D. Jensen, Densen Cao
- Full text
- Google Patents
The suits
4 cases · N.D. Ill. (4)
| Filed | Defendant | Plaintiff | Court | Docket |
|---|---|---|---|---|
| 2026-06-01 | Martin Grof | CAO Group, Inc. | N.D. Ill. | 1:26-cv-06410 |
| 2026-06-01 | Wencan Zhu | CAO Group, Inc. | N.D. Ill. | 1:26-cv-06409 |
| 2026-09-25 | HISMILE PTY LTD. | CAO Group, Inc. | N.D. Ill. | 1:26-cv-11795 |
| 2026-09-25 | HISMILE PTY LTD. | CAO Group, Inc. | N.D. Ill. | 1:26-cv-11795 |
Docket links open the public record on CourtListener. Filing dates are the complaint's.
Independent claims
What is actually asserted, verbatim.
1. A dental whitening device, comprising: a strip of backing material, wherein the strip of backing material is flexible and planar such that the strip of backing material has two flat sides; a gelatinous, non-coalescent, visco-elastic dental composition conjoined to at least a portion of one of the flat sides of the strip of backing material, the dental composition being comprised of a tooth whitening agent, a solvent, and a thickening agent selected from the set of thickening agents consisting of polyethyloxazoline and polyvinylpyrrolidone (PVP); wherein when adhered to a user's dental arch both the dental composition and the backing material flex and conform to the user's dental arch without cracking or breaking.
2. A dental whitening device, comprising: a strip of backing material, wherein the strip of backing material is flexible and planar such that the strip of backing material has two flat sides; a non-fluid dental composition conjoined to at least a portion of one of the flat sides of the strip of backing material, the dental composition being comprised of a peroxide bleaching tooth whitening agent, a solvent, and a thickening agent selected from the set of thickening agents consisting of polyethyloxazoline and polyvinylpyrrolidone (PVP); wherein the conjoined dental composition is gelatinous, non-coalescent, and visco-elastic during storage of the dental bleaching device at room temperature for a period of time up to six months in a package and also after the dental bleaching device has been removed from a package and adhered to a user's dental arch such that both the dental composition and backing material together flex and conform to the particular irregularities of a user's dental arch without cracking or breaking.
3. A dental whitening composition, comprising: a tooth whitening agent; and a thickening agent selected from the set of thickening agents consisting of polyethyloxazoline and polyvinylpyrrolidone (PVP); wherein the dental whitening composition is a gelatinous, non-coalescent, and visco-elastic substance in the shape of a planar strip such that when removed from a package the strip may be applied directly to a user's teeth in a manner that conforms to that individual user's dental arch as the dental composition flexes and conforms to the user's dental arch without cracking or breaking.
Art before the examiner
2 references of record, 2 cited by the examiner.
Everything listed here was before the Office and is what a challenge must go beyond. Art the examiner never saw is where an invalidity search starts.
Examiner-cited
- US20040241110A1 — Jelly-type tooth-bleaching patch (Sang-Ho Lee)
- US20090130624A1 — Methods and kits for making flexible dental guards (Benjamin Jiemin Sun)
Classification
- A61K8/22primary — Peroxides; Oxygen; Ozone
- A61K2800/48 — Thickener, Thickening system
- A61K2800/87 — Application Devices; Containers; Packaging
- A61K2800/92 — Oral administration
- A61K8/0208 — Tissues; Wipes; Patches
- A61K8/49 — Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
- A61K8/84 — Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions otherwise than those involving only carbon-carbon unsaturated bonds
- A61Q11/00 — Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses
- A61Q11/02 — Preparations for deodorising, bleaching or disinfecting dentures
- A61Q5/00 — Preparations for care of the hair
- A61Q5/08 — Preparations for bleaching the hair
Family
- US11826444B2 — B2 (2023)
- US9295620B2 — B2 (2016)
- US20220110844A1 — A1 (2022)
- US20200170898A1 — A1 (2020)
- US20170216168A1 — A1 (2017)
- US20090087393A1 — A1 (2009)
- US9295619B2 — B2 (2016)
- US9789036B2 — B2 (2017)
- US20220233417A1 — A1 (2022)
- US10603259B2 — B2 (2020)
- US11826445B2 — B2 (2023)
- US20230061518A1 — A1 (2023)
- US20090238779A1 — A1 (2009)
- US20230404871A1 — A1 (2023)
- US20200170899A1 — A1 (2020)
- US11219582B2 — B2 (2022)
- US10646419B2 — B2 (2020)
- US20170281487A1 — A1 (2017)
- US20150238397A1 — A1 (2015)
- US20230346655A1 — A1 (2023)
Abstract
The present invention is a formable dental treatment tray utilizing poly(2-ethyl-2-oxazoline) and a gelatinous active. Blending of the active is accomplished by mixing the Poly(2-ethyl-2-oxazoline) with an active ingredient, such as a peroxide like hydrogen peroxide, carbamide peroxide, sodium perborate, or sodium percarbonate, usually also with water or an appropriate organic solvent. Peroxide concentrations in these new gels can reach a 30% concentration of hydrogen peroxide while maintaining a shelf life of six months at room temperature without developing peroxide decomposition. The gels are applied to an appropriate backing and dried to a gelatinous state. In use, the active is hydrated and regains adhesiveness. Then the tray is pressed and formed around a user's dental arch to form the customizable tray. Multiple active ingredients may be used, with or without peroxide, for accomplishing desired treatment regimens.
Named in one of these suits? A prior-art search is commissioned once and serves every defendant who shares it. The examiner's own search record is free on the tools page, and your first preliminary search is free — one claim, back within 24 hours — so you know whether there is art the Office never saw before anyone pays for more. Flat fees: $2,500$899 for the independent claims, $5,000$1,500 for every asserted claim.
This page is assembled from public records — federal court dockets and the patent's own file — and is updated as the case list changes. It states what the record shows and is not an opinion on the validity or infringement of any claim. Patent data via Google Patents; docket data via CourtListener.