Patent US4265247A successfully refreshed from Google Patents.
US4265247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Malic acid polymers
Assignee: Research Corp
•
Filing: 1979-11-07
•
Granted: 1981-05-05
•
Expires: 1999-11-07
Abstract
Abstract A polymer containing repeating units of the formula: <IMAGE> wherein R1 and R2 are independently hydrogen, alkyl, aryl, aralkyl, substituted alkyl, substituted aryl, substituted aralkyl, R3 is hydrogen, alkyl or -CH2)nCOOR8 where n is an integer of 0 to 10, R6 is OR or NR4R5, wherein R and R8 are independently hydrogen or a group derived from a compound containing esterifiable hydroxyl groups, R4 and R5 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
2026-10-23 14:12
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: 17
Claim 1
Independent Claim
99 words
A polymer containing repeating units of the formula: ##STR6## 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
99 words
A polymer containing repeating units of the formula: ##STR6## 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
28 words
The polymer of claim 1, wherein R 1 , R 2 and R 3 are hydrogen and R 6 is OR where R is benzyl, methyl or ethyl.
Claim 4
Dependent Claim
30 words
The polymer of claim 1, wherein R 3 is methyl and R 1 and R 2 are hydrogen and R 6 is OR where R is benzyl, methyl or ethyl.
Claim 5
Dependent Claim
24 words
The polymer of claim 1, wherein R 1 and R 2 are hydrogen and R 3 is --CH 2 ) n COOR 8 .
Claim 6
Dependent Claim
9 words
The polymer of claim 4, wherein R is methyl.
Claim 7
Dependent Claim
19 words
The polymer of claim 1, wherein repeating units derived from lactones, cyclic esters, lactams or cyclic amides are present.
Claim 8
Dependent Claim
13 words
The polymer of claim 1, wherein repeating units derived from caprolactam are present.
Claim 9
Dependent Claim
12 words
The polymer of claims 2, 3 or 4 wherein R is benzyl.
Claim 10
Dependent Claim
33 words
A copolymer obtained by copolymerizing caprolactam or caprolactone with a monomer having the formula: ##STR7## wherein R 1 , R 2 , R 3 and R 6 are as defined in claim 1.
Claim 11
Dependent Claim
16 words
The copolymer of claim 9, wherein R 6 is converted to a hydroxyl group after polymerization.
Claim 12
Dependent Claim
20 words
A suture prepared from the polymer of claim 1, wherein R 1 , R 2 and R 3 are hydrogen.
Claim 13
Dependent Claim
22 words
A suture prepared from the polymer of claim 1, wherein R 1 and R 2 are hydrogen and R 3 is methyl.
Claim 14
Dependent Claim
26 words
A suture prepared from the polymer of claim 1, wherein R 1 and R 2 are hydrogen and R 3 is --CH 2 )COOR 8 .
Claim 15
Dependent Claim
9 words
A fiber prepared from the polymer of claim 1.
Claim 16
Dependent Claim
9 words
A fiber prepared from the polymer of claim 10.
Claim 17
Dependent Claim
9 words
Biodegradable packaging prepared from the polymer of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |