US5244665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cosmetic composition
Assignee: Chesebrough Ponds USA Inc
•
Filing: 1992-05-06
•
Granted: 1993-09-14
•
Expires: 2012-05-06
Abstract
Abstract A composition suitable for topical application to human skin for reducing the damaging effects of ultra-violet light on skin comprises: (a) an effective amount of a triester of citric acid having the structure (1): ##STR1## where R 1 , R 2 , and R 3 each independently represent a branched or unbranched alkyl, alkenyl, aryl, alkylaryl or arylalkyl group, each said group being optionally substituted and having from 1 to 18 carbon atoms, R 4 represents --H, or a branched or unbranched saturated or unsaturated acyl, alkyl, aryl, alkylaryl or arylalkyl group, each said group being optionally substituted and having from 1 to 18 carbon atoms; and (b) a cosmetically acceptable vehicle for the citric acid ester; and (c) an effective amount of a sunscreen agent, with the proviso that in the case where the sunscreen agent is an inorganic sunscreen, it has an average particle size of less than 100 μm.
Inventors
- 👤 Collur V. Natraj
- 👤 Govindarajan Raman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:04
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/33; A61K8/37; A61K8/19; A61K8/29; A61Q; A61Q17/00; A61Q17/04; B; B82; B82Y; B82Y5/00; A61K2800/00; A61K2800/40; A61K2800/41; A61K2800/413
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
182 words
A composition suitable for topical application to human skin in order to reduce the damaging effects of ultra-violet light on skin, which composition comprises: (a) from 0.01 to 20% of a triester of citric acid having the structure (1): ##STR5## where R 1 , R 2 and R 3 each independently represent a branched or unbranched alkyl, alkenyl, aryl, alkylaryl or arylalkyl group, each said group being optionally substituted and having from 1 to 18 carbon atoms, R 4 represents --H, or a branched or unbranched saturated or unsaturated acyl, alkyl, aryl, alkylaryl or arylalkyl group, each said group being optionally substituted and having from 1 to 18 carbon atoms; and (b) a cosmetically acceptable vehicle for the citric ester present in an effective amount to facilitate distribution of the ester when the composition is applied to the skin; and (c) from 0.1 to 25% of a sunscreen agent which is an organic or inorganic sunscreen, with the proviso that in the case where the sunscreen agent is an inorganic sunscreen, it has an average particle size of less than 100 μm.
Claim 2
Dependent Claim
182 words
A composition suitable for topical application to human skin in order to reduce the damaging effects of ultra-violet light on skin, which composition comprises: (a) from 0.01 to 20% of a triester of citric acid having the structure (1): ##STR5## where R 1 , R 2 and R 3 each independently represent a branched or unbranched alkyl, alkenyl, aryl, alkylaryl or arylalkyl group, each said group being optionally substituted and having from 1 to 18 carbon atoms, R 4 represents --H, or a branched or unbranched saturated or unsaturated acyl, alkyl, aryl, alkylaryl or arylalkyl group, each said group being optionally substituted and having from 1 to 18 carbon atoms; and (b) a cosmetically acceptable vehicle for the citric ester present in an effective amount to facilitate distribution of the ester when the composition is applied to the skin; and (c) from 0.1 to 25% of a sunscreen agent which is an organic or inorganic sunscreen, with the proviso that in the case where the sunscreen agent is an inorganic sunscreen, it has an average particle size of less than 100 μm.
Claim 3
Dependent Claim
27 words
A composition according to claim 1, wherein R 1 , R 2 , and R 3 are unsubstituted alkyl groups having from 1 to 8 carbon atoms.
Claim 4
Dependent Claim
15 words
A composition according to claim 1 wherein the ester of citric acid is tri-n-butyl citrate.
Claim 5
Dependent Claim
37 words
A composition according to claim 1 wherein R 4 is selected from the groups consisting of an acyl group having from 2 to 4 carbon atoms and an alkyl group having from 1 to 4 carbon atoms.
Claim 6
Dependent Claim
16 words
A composition according to claim 1 comprising from 0.1 to 10% of an organic sunscreen material.
Claim 7
Dependent Claim
16 words
A composition according to claim 1 comprising from 1 to 25% of an inorganic sunscreen material.
Claim 8
Dependent Claim
19 words
A composition according to claim 6 wherein the inorganic sunscreen comprises a mixture of water-dispersible and oil-dispersible titanium dioxide.
Claim 9
Dependent Claim
21 words
A composition according to claim 7 wherein the titanium dioxide has a mean particle size of from 15 to 25 nm.
Claim 10
Independent Claim
180 words
A method for reducing the damaging effects of ultra-violet light on skin comprising topically applying to the skin a composition comprising: (a) from 0.1 to 20% of a triester of citric acid having the structure (1): ##STR6## where R 1 , R 2 and R 3 each independently represent a branched or unbranched alkyl, alkenyl, aryl, alkylaryl or arylalkyl group, each said group being optionally substituted and having from 1 to 18 carbon atoms. R 4 represents --H, or a branched or unbranched saturated or unsaturated acryl, arlkyl, aryl, alkylaryl or arylalkyl group, each said group being optionally substituted and having from 1 to 18 carbon atoms; and (b) a cosmetically acceptable vehicle for the citric ester present in an effective amount to facilitate distribution of the ester when the composition is applied to the skin; and (c) from 0.1 to 25% of a sunscreen agent which is an organic or inorganic suns screen, with the proviso that in the case where the sunscreen agent is an inorganic sunscreen, it has an average particle size of less than 100 μm.
Claim 11
Independent Claim
180 words
A method for reducing the damaging effects of ultra-violet light on skin comprising topically applying to the skin a composition comprising: (a) from 0.1 to 20% of a triester of citric acid having the structure (1): ##STR6## where R 1 , R 2 and R 3 each independently represent a branched or unbranched alkyl, alkenyl, aryl, alkylaryl or arylalkyl group, each said group being optionally substituted and having from 1 to 18 carbon atoms. R 4 represents --H, or a branched or unbranched saturated or unsaturated acryl, arlkyl, aryl, alkylaryl or arylalkyl group, each said group being optionally substituted and having from 1 to 18 carbon atoms; and (b) a cosmetically acceptable vehicle for the citric ester present in an effective amount to facilitate distribution of the ester when the composition is applied to the skin; and (c) from 0.1 to 25% of a sunscreen agent which is an organic or inorganic suns screen, with the proviso that in the case where the sunscreen agent is an inorganic sunscreen, it has an average particle size of less than 100 μm.
Claim 12
Dependent Claim
15 words
A method according to claim 9 wherein the ester of citric acid is tri-n-butyl citrate.
References Cited (Backward Citations)
GB995175A
Cited
US3214338A
Cited
DE2826758A1
Cited
EP0006232A1
Cited
US4515810A
Cited
US4908389A
Cited
EP0260859A1
Cited
US4866202A
Cited
US4866203A
Cited
US5047166A
Cited
US4847071A
Cited
EP0347664A1
Cited
EP0357186A2
Cited
US5089531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-13 | 1997-03-15 | 1997-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-13 | 2001-03-15 | 2001-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-13 | 2005-03-15 | 2005-09-14 | $7700.00 | Window Closed / Lapsed |