US4514385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-acne compositions
Assignee: Alcon Vision LLC
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Filing: 1981-10-05
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Granted: 1985-04-30
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Expires: 2001-10-05
Abstract
Abstract Anti-acne preparations include finely divided, dispersed particles of benzoyl peroxide and finely divided, dispersed particles of salicylic acid in an aqueous gel formed from carboxy vinyl polymer resins. The gels are prepared without loss of salicylic acid by fully hydrating the resin in an aqueous medium and allowing the resin to gel in the absence of an alkaline neutralizing agent.
Inventors
- 👤 Nalinkant C. Damani
- 👤 Haresh G. Bhagat
- 👤 Ramon L. McElhaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:46
CPC Classifications
A; A61; A61Q; A61Q19/00; A61Q19/008; A61K; A61K31/00; A61K31/60; A61K8/00; A61K8/18; A61K8/30; A61K8/33; A61K8/36; A61K8/368; A61K8/38; A61K8/40; A61K8/44; A61K8/72; A61K8/81; A61K8/8141; A61K8/8147; A61K2800/00; A61K2800/40; A61K2800/51
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A stable single phase composition for the treatment of acne and seborrhea comprising: an aqueous gel of between about 0.1 and about 4.0 percent by weight of a fully hydrated carboxy vinyl polymer resin in the absence of an agent that gels said resin through neutralization, between about 0.1 and about 25 percent by weight finely divided particles of salicylic acid dispersed in said gel, and between 0.5 and about 25 percent by weight finely divided particles of benzoyl peroxide dispersed in said gel.
Claim 2
Dependent Claim
84 words
A stable single phase composition for the treatment of acne and seborrhea comprising: an aqueous gel of between about 0.1 and about 4.0 percent by weight of a fully hydrated carboxy vinyl polymer resin in the absence of an agent that gels said resin through neutralization, between about 0.1 and about 25 percent by weight finely divided particles of salicylic acid dispersed in said gel, and between 0.5 and about 25 percent by weight finely divided particles of benzoyl peroxide dispersed in said gel.
Claim 3
Dependent Claim
38 words
A composition in accordance with claim 1 wherein the average particle size of said benzoyl peroxide is less than about 60 mesh and wherein the average particle size of said salicylic acid is less than about 60 mesh.
Claim 4
Dependent Claim
25 words
A composition in accordance with claim 1 also including a chelating agent in amounts of up to about 0.3 percent by weight of said composition.
Claim 5
Dependent Claim
19 words
A composition in accordance with claim 3 wherein said chelating agent is EDTA or a pharmaceutically acceptable salt thereof.
Claim 6
Dependent Claim
18 words
A composition in accordance with claim 1 including up to about 30 percent by weight of a surfactant.
Claim 7
Independent Claim
63 words
A method of suspending salicylic acid and benzoyl peroxide in carboxy vinyl polymer gels comprising dispersing a carboxy vinyl polymer resin in an aqueous medium and fully hydrating said resin, dispersing finely divided salicylic acid and finely divided benzoyl peroxide in said fully hydrated resin and allowing said resin to gel in the absence of an agent that gels said resin through neutralization.
Claim 8
Independent Claim
63 words
A method of suspending salicylic acid and benzoyl peroxide in carboxy vinyl polymer gels comprising dispersing a carboxy vinyl polymer resin in an aqueous medium and fully hydrating said resin, dispersing finely divided salicylic acid and finely divided benzoyl peroxide in said fully hydrated resin and allowing said resin to gel in the absence of an agent that gels said resin through neutralization.
References Cited (Backward Citations)
GB2018589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |