US4696757A
Expired / Lapsed
US
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Stable hydrogen peroxide gels
Assignee: Wyeth LLC
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Filing: 1986-06-16
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Granted: 1987-09-29
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Expires: 2006-06-16
Abstract
Abstract Aqueous hydrogen peroxide gels possessing enhanced low temperature stability, useful in treating surface cuts and bleaching hair, are prepared employing certain polyoxyethylene polyoxypropylene block copolymers as gelling agents together with glycerine.
Inventors
- 👤 Robert G. Blank
- 👤 Dhiraj S. Mody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:14
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/22; A61K8/02; A61K8/04; A61K8/042; A61K8/72; A61K8/90; A61Q; A61Q5/00; A61Q5/08; C; C08; C08K; C08K3/00; C08K3/18; C08K5/00; C08K5/04; C08K5/05; C08K5/053; A61K2800/00; A61K2800/40; A61K2800/52
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
A gel stable at temperatures below about 50° F. comprising, based on a total of 100 parts by weight, (a) from about 5 parts to about 20 parts of hydrogen peroxide, (b) from about 20 parts to about 60 parts of water, and (c) from about 18 parts to about 30 parts of a co-polymer of the formula HO(C.sub.2 H.sub.4 O).sub.b (C.sub.3 H.sub.6 O).sub.a (C.sub.2 H.sub.4 O).sub.b H wherein a is an integer such that the hydrophobe base represented by (C 3 H 6 O) has an average molecular weight of from 2750 to 4000 and b is an integer such that the hydrophile portion represented by (C 2 H 4 O) constitutes from about 45 to 80 weight percent of the copolymer, and (d) at least 30 parts of glycerine.
Claim 2
Dependent Claim
131 words
A gel stable at temperatures below about 50° F. comprising, based on a total of 100 parts by weight, (a) from about 5 parts to about 20 parts of hydrogen peroxide, (b) from about 20 parts to about 60 parts of water, and (c) from about 18 parts to about 30 parts of a co-polymer of the formula HO(C.sub.2 H.sub.4 O).sub.b (C.sub.3 H.sub.6 O).sub.a (C.sub.2 H.sub.4 O).sub.b H wherein a is an integer such that the hydrophobe base represented by (C 3 H 6 O) has an average molecular weight of from 2750 to 4000 and b is an integer such that the hydrophile portion represented by (C 2 H 4 O) constitutes from about 45 to 80 weight percent of the copolymer, and (d) at least 30 parts of glycerine.
Claim 3
Dependent Claim
33 words
The stable gel of claim 1 wherein the copolymer has a hydrophobe base having an average molecular weight of about 4000 and the hydrophile portion constitutes about 70 weight percent of the copolymer.
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) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |