US4320753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Malic acid polymers
Assignee: Research Corp
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Filing: 1979-11-09
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Granted: 1982-03-23
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Expires: 1999-11-09
Abstract
Abstract A polymer containing repeating units of the formula: ##STR1## wherein R 1 and R 2 are independently hydrogen, alkyl, aryl, aralkyl, substituted alkyl, substituted aryl, substituted aralkyl, R 3 is hydrogen, alkyl or CH 2n COOR 8 where n is an integer of 0 to 10, R 6 is OR or NR 4 R 5 , wherein R and R 8 are independently hydrogen or a group derived from a compound containing esterifiable hydroxyl groups, R 4 and R 5 are independently alkyl, aryl, aralkyl, substituted alkyl, substituted aryl, substituted aralkyl or together comprise an alkylene group.
Inventors
- 👤 Robert W. Lenz
- 👤 Michel Vert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:49
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61K9/204; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; A61L15/38; A61L15/42; A61L15/64; A61L17/00; A61L17/06; A61L17/10; A61L17/105
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A bandage prepared from a polymer containing repeating units of the formula: ##STR10## wherein R 1 and R 2 are independently hydrogen, alkyl, aryl, aralkyl, substituted alkyl, substituted aryl, substituted aralkyl, R 3 is hydrogen, alkyl or --CH 2 ) n COOR 8 where n is an integer of 0 to 10, R 6 is OR or NR 4 R 5 , wherein R and R 8 are independently hydrogen or a group derived from a compound containing esterifiable hydroxyl groups, R 4 and R 5 are independently alkyl, aryl, aralkyl, substituted alkyl, substituted aryl, substituted aralkyl or together comprise an alkylene group.
Claim 2
Dependent Claim
103 words
A bandage prepared from a polymer containing repeating units of the formula: ##STR10## wherein R 1 and R 2 are independently hydrogen, alkyl, aryl, aralkyl, substituted alkyl, substituted aryl, substituted aralkyl, R 3 is hydrogen, alkyl or --CH 2 ) n COOR 8 where n is an integer of 0 to 10, R 6 is OR or NR 4 R 5 , wherein R and R 8 are independently hydrogen or a group derived from a compound containing esterifiable hydroxyl groups, R 4 and R 5 are independently alkyl, aryl, aralkyl, substituted alkyl, substituted aryl, substituted aralkyl or together comprise an alkylene group.
Claim 3
Dependent Claim
20 words
A bandage prepared from the copolymer of claim 1, wherein R 1 , R 2 and R 3 are hydrogen.
Claim 4
Dependent Claim
22 words
A bandage prepared from the copolymer of claim 1, wherein R 1 and R 2 are hydrogen and R 3 is methyl.
Claim 5
Dependent Claim
28 words
A bandage prepared from the copolymer of claim 1, wherein R 1 and R 2 are hydrogen and R 3 is --CH 2 ) n COOR 8 .
Claim 6
Dependent Claim
20 words
The bandage of any one of claims 2, 3 or 4, wherein R is an enzyme used in burn debridement.
References Cited (Backward Citations)
US3419006A
Cited
US3983095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1985-03-22 | 1985-09-21 | 1986-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-22 | 1989-09-21 | 1990-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-22 | 1993-09-21 | 1994-03-23 | $7700.00 | Window Closed / Lapsed |