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US4322401A
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Permanent-wave solution
Assignee: Individual
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Filing: 1980-12-18
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Granted: 1982-03-30
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Expires: 2000-12-18
Abstract
Abstract Permanent-wave solution comprising an aqueous alkaline solution of cysteine and an organic acid anhydride as added thereto in a molar ratio of 0.1 to 0.5 per each mole of cysteine is disclosed. The solution is stable upon exposure to air while retaining a sufficient curling effect on the hair.
Inventors
- 👤 Morio Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:49
CPC Classifications
A; A61; A61Q; A61Q5/00; A61Q5/04; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/33; A61K8/36; A61K8/362; A61K8/40; A61K8/44; A61K8/447
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
A permanent-wave solution consisting essentially of an aqueous alkaline solution of a permanent wave effective amount of cysteine and a stabilizing amount of an organic acid anhydride selected from the group consisting of succinic anhydride and phthalic anhydride as solubilizing agent in a molar ratio of about 0.1 to about 0.5 per each mole of cysteine.
Claim 2
Dependent Claim
56 words
A permanent-wave solution consisting essentially of an aqueous alkaline solution of a permanent wave effective amount of cysteine and a stabilizing amount of an organic acid anhydride selected from the group consisting of succinic anhydride and phthalic anhydride as solubilizing agent in a molar ratio of about 0.1 to about 0.5 per each mole of cysteine.
Claim 3
Dependent Claim
29 words
The permanent-wave solution according to claim 1 wherein said cysteine is contained in a proportion of about 3 to about 15% based on the weight of the permanent-wave solution.
Claim 4
Dependent Claim
21 words
The permanent-wave solution according to claim 2 wherein the pH of said permanent-wave solution is between about 8 to about 10.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-29 | 1985-09-28 | 1986-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-29 | 1989-09-28 | 1990-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-29 | 1993-09-28 | 1994-03-30 | $7700.00 | Window Closed / Lapsed |