Patent US4412054A successfully refreshed from Google Patents.
US4412054A
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Antithrombogenic polyurethanes based on fluorinated prepolymers
Assignee: AGC Inc
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Filing: 1982-08-17
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Granted: 1983-10-25
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Expires: 2002-08-17
Abstract
Abstract An antithrombogenic material is composed of a fluorine-containing block polymer obtained by the polyaddition or polycondensation of a prepolymer with a chain extender, said prepolymer being a diisocyanate prepolymer represented by the formula OCN-CH2RfCH2NHCOO-A-CONH]mCH2RfCH2NCO (I) wherein Rf is a perfluoroalkylene or perfluoroxyalkylene group having from 1 to 20 carbon atoms and containing from 0 to 10 ether linkages, A is a divalent organic group containing an oxygen atom in its main chain and m is from 1 to 3, or a dicarbamate prepolymer obtained by reacting the diisocyanate prepolymer with a lower alcohol.
Inventors
- 👤 Masaaki Yamabe
- 👤 Masao Kato
- 👤 Teruo Takakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:32
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/773; A; A61; A61L; A61L27/00; A61L27/14; A61L27/18; A61L33/00; A61L33/06; A61L33/068; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/904
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
An antithrombogenic material which is composed of a fluorine-containing block polymer obtained by the polyaddition or polycondensation of a prepolymer with a chain extender, said prepolymer being a diisocyanate prepolymer represented by the formula OCN--CH.sub.2 RfCH.sub.2 NHCOO--A--CONH].sub.m CH.sub.2 RfCH.sub.2 NCO (I) where Rf is a perfluoroalkylene or perfluoroxyalkylene group having from 1 to 20 carbon atoms and containing from 0 to 10 ether linkages, A is a divalent organic group containing an oxygen atom in its main chain and m is from 1 to 3, or a dicarbamate prepolymer obtained by reacting the diisocyanate prepolymer with a lower alcohol.
Claim 2
Dependent Claim
99 words
An antithrombogenic material which is composed of a fluorine-containing block polymer obtained by the polyaddition or polycondensation of a prepolymer with a chain extender, said prepolymer being a diisocyanate prepolymer represented by the formula OCN--CH.sub.2 RfCH.sub.2 NHCOO--A--CONH].sub.m CH.sub.2 RfCH.sub.2 NCO (I) where Rf is a perfluoroalkylene or perfluoroxyalkylene group having from 1 to 20 carbon atoms and containing from 0 to 10 ether linkages, A is a divalent organic group containing an oxygen atom in its main chain and m is from 1 to 3, or a dicarbamate prepolymer obtained by reacting the diisocyanate prepolymer with a lower alcohol.
Claim 3
Dependent Claim
23 words
The antithrombogenic material according to claim 1 wherein A is an oxyalkylene group having an average molecular weight of from 40 to 10,000.
Claim 4
Dependent Claim
14 words
The antithrombogenic material according to claim 1 wherein the chain extender is a diamine.
References Cited (Backward Citations)
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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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |