US4810489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High oil phase pharmaceutical vehicles and sunscreen compositions having waterproof sun protection factors
Assignee: CUTIX INC
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Filing: 1986-12-04
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Granted: 1989-03-07
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Expires: 2006-12-04
Abstract
Abstract High oil phase pharmaceutical vehicles in the form of an emulsion system having an oil phase content of from about 35% to about 65%, wherein the emulsion system comprises from about 1% to about 10% of an alkylated PVP copolymer, from about 2% to about 10% of an emulsifier, and a solvent system. The solvent system comprises from about 4% to about 20% of a C4-C22 fatty acid, alcohol or ester thereof, from about 2% to about 25% of a glycol ester or diester, and from 0% to about 13% of a branched chain ester of a C4-C22 carboxylic acid. The pharmaceutical vehicles are useful in sunscreen formulations, and especially those containing higher concentrations of benzophenone-3. When such higher concentrations are used, it is advantageous to add up to about 10% of a branched chain ester of a C4-C22 carboxylic acid.
Inventors
- 👤 Terrence J. Murray
- 👤 Bhiku G. Patel
- 👤 Richard O. Muhlhauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:28
CPC Classifications
A; A61; A61Q; A61Q17/00; A61Q17/04; A61K; A61K8/00; A61K8/02; A61K8/04; A61K8/06; A61K8/18; A61K8/30; A61K8/33; A61K8/35; A61K8/37; A61K8/375; A61K8/40; A61K8/44; A61K8/445; A61K8/55; A61K8/72; A61K8/81; A61K8/817; A61K8/8182
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
122 words
A water proof sunscreen formulation in the form of an aqueous emulsion system having an oil phase content of from about 35% to about 65%, wherein the emulsion system comprises: from about 1% to about 10% of an oil soluble polyvinylpyrrolidone and long alkyl chain olefin copolymer; from about 2% to about 10% of an emulsifier; a solvent system comprising from about 4% to about 20% of a C 4 -C 22 fatty acid, alcohol or ester thereof, from about 4% to about 25% of a glycol ester or diester, and from 0% to about 13% of a branched chain ester of a C 4 -C 22 carboxylic acid; and from about 1% to about 25% of at least one sunscreen agent.
Claim 2
Dependent Claim
122 words
A water proof sunscreen formulation in the form of an aqueous emulsion system having an oil phase content of from about 35% to about 65%, wherein the emulsion system comprises: from about 1% to about 10% of an oil soluble polyvinylpyrrolidone and long alkyl chain olefin copolymer; from about 2% to about 10% of an emulsifier; a solvent system comprising from about 4% to about 20% of a C 4 -C 22 fatty acid, alcohol or ester thereof, from about 4% to about 25% of a glycol ester or diester, and from 0% to about 13% of a branched chain ester of a C 4 -C 22 carboxylic acid; and from about 1% to about 25% of at least one sunscreen agent.
Claim 3
Dependent Claim
22 words
The sunscreen of claim 1 wherein the copolymer comprises a copolymer of polyvinylpyrrolidone and hexadecene or a copolymer of polyvinylpyrrolidone and eicosene.
Claim 4
Dependent Claim
20 words
The sunscreen of claim 2 wherein the copolymer is present in an amount of from about 2.5% to about 7.5%.
Claim 5
Dependent Claim
15 words
The sunscreen of claim 3 wherein the emulsifier comprises cetyl phosphate and DEA cetyl phosphate.
Claim 6
Dependent Claim
20 words
The sunscreen of claim 4 wherein the emulsifier is present in an amount of from about 2% to about 5%.
Claim 7
Dependent Claim
30 words
The sunscreen of claim 1 wherein the solvent system comprises from about 8% to about 12% of isopropyl myristate and from about 4% to about 16% of propylene glycol dioctanoate.
Claim 8
Dependent Claim
15 words
The sunscreen of claim 6 wherein the copolymer comprises a copolymer of polyvinylpyrrolidone and eicosene.
Claim 9
Dependent Claim
93 words
The sunscreen of claim 7 comprising: from about 2.5% to about 7.5% of a copolymer of polyvinylpyrrolidone and eicosene; from about 8% to about 12% of isopropyl myristate; from about 6% to about 18% of propylene glycol dioctanoate from about 2% to about 3% of cetyl phosphate and DEA cetyl phosphate; from 0% to about 10% of PABA or derivative thereof; from 0% to about 9% of octyl methoxycinnamate; from 0% to about 7% of octyl salicylate; from 0% to about 6% of benzophenone-3; and from 0% to about 10% of isodecyl neopentanoate.
Claim 10
Dependent Claim
21 words
The sunscreen of claim 8 comprising: about 5% of a copolymer of polyvinylpyrrolidone and eicosene; and about 10% of isopropyl myristate.
Claim 11
Dependent Claim
23 words
The sunscreen of claim 9 comprising: about 16% of propylene glycol dioctanoate; and from about 1.5 to about 2% of octyl dimethyl PABA.
Claim 12
Dependent Claim
23 words
The sunscreen of claim 9 comprising: about 14% of propylene glycol dioctanoate; about 3% of benzophenone-3; and about 4% of octyl dimethyl PABA.
Claim 13
Dependent Claim
31 words
The sunscreen of claim 9 comprising: about 6% of benzophenone-3; and from about 5% to about 8% of isodecyl neopentanoate; and from about 5% to about 10% of propylene glycol dioctanoate.
Claim 14
Dependent Claim
10 words
The sunscreen of claim 12 comprising about 7% octyl methoxycinnamate.
Claim 15
Dependent Claim
11 words
The sunscreen of claim 13 comprising about 5% of octyl salicilate.
Claim 16
Dependent Claim
12 words
The sunscreen of claim 13 comprising about 8% of octyl dimethyl PABA.
Claim 17
Dependent Claim
15 words
The sunscreen of claim 12 comprising about 5% to about 8% of octyl dimethyl PABA.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |