Patent US6301478B1 successfully refreshed from Google Patents.
US5338539A
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Benzofuran derivatives useful as sunscreens
Assignee: 3V Inc
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Filing: 1993-06-07
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Granted: 1994-08-16
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Expires: 2013-06-07
Abstract
Abstract Benzofuran derivatives of formula (I) ##STR1## in which R is alkyl, cycloalkyl, aralkyl or a divalent residue which is in its turn linked to a residue which can be obtained from (I) by removing R, highly absorb the sunlight radiations in the UVA region and, in combination with UVB sunscreens, they effectively protect the skin from noxious sunlight radiations.
Inventors
- 👤 Giuseppe Raspanti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:10
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/02; C07D405/12; C07D307/00; C07D307/77; C07D307/78; C07D307/79; C07D307/81
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
A compound of formula (I) ##STR11## in which R is C 1 -C 18 straight or branched alkyl, C 5 -C 12 cycloalkyl, or a group of formula (II), (III) or (IV) ##STR12## in which R 4 and R 5 are hydrogen or methyl; A is C 1 -C 18 straight or branched alkyl, C 5 -C 8 cycloalkyl, n can be an integer 1 to 10; X is C 2 -C 18 straight or branched alkylene or the divalent residue of formula (V) or (VI) ##STR13## in which m is an integer 1 to 20 and R 6 is hydrogen, methyl or ethyl; R 1 and R 2 can be the same or different and are hydrogen or C 1 -C 8 straight or branched alkyl; R 3 is hydrogen or lower alkoxy.
Claim 2
Dependent Claim
134 words
A compound of formula (I) ##STR11## in which R is C 1 -C 18 straight or branched alkyl, C 5 -C 12 cycloalkyl, or a group of formula (II), (III) or (IV) ##STR12## in which R 4 and R 5 are hydrogen or methyl; A is C 1 -C 18 straight or branched alkyl, C 5 -C 8 cycloalkyl, n can be an integer 1 to 10; X is C 2 -C 18 straight or branched alkylene or the divalent residue of formula (V) or (VI) ##STR13## in which m is an integer 1 to 20 and R 6 is hydrogen, methyl or ethyl; R 1 and R 2 can be the same or different and are hydrogen or C 1 -C 8 straight or branched alkyl; R 3 is hydrogen or lower alkoxy.
Claim 3
Dependent Claim
57 words
The compounds of claim 1 where R 1 , R 2 and R 3 are hydrogen and R is selected from the group consisting of C 4 H 9 --CH(C 2 H 5 )--CH 2 --, CH 3 --CH(CH 3 )--CH 2 --, C 2 H 5 --CH (C 2 H 5 )--CH 2 --, and ##STR14##
Claim 4
Dependent Claim
28 words
The compounds of claim 1 wherein R 1 , R 2 and R 3 are hydrogen, R is formula (IV) and X is selected from the group ##STR15##
Claim 5
Dependent Claim
30 words
Cosmetic or dermatological compositions containing a cosmetic or dermatological carrier and from about 0.05 to about 15% by weight of at least one of the compounds according to claim 1.
Claim 6
Dependent Claim
30 words
Cosmetic or dermatological compositions containing a cosmetic or dermatological carrier and from about 0.1 to about 10% by weight of at least one of the compounds according to claim 1.
Claim 7
Dependent Claim
49 words
A method for the protection of skin from ultraviolet radiations of sunlight, comprising applying to the skin an ultraviolet radiation absorbing effective amount of a cosmetic or dermatological composition having from about 0.05 to about 15% by weight of at least one of the compounds according to claim 1.
Claim 8
Dependent Claim
12 words
The method of claim 6 wherein the composition is a dermatological composition.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |