Patent US1536686A successfully refreshed from Google Patents.
Patent US3977904A successfully refreshed from Google Patents.
Patent US3853804A successfully refreshed from Google Patents.
US3853804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionic block elastomeric polymers
Assignee: California Institute of Technology
•
Filing: 1973-07-16
•
Granted: 1974-12-10
•
Expires: 1993-07-16
Abstract
Abstract A neutral elastomer is prepared by the urethane linking reaction of diisocyanates with tertiary amino diols. The neutral elastomer is quaternized and is then reacted with an anionic polymer such as heparin to form ionically bonded block elastomeric copolymers. The heparin copolymer has non-thrombogenic characteristics. It can be dissolved in solvents and ultized to form a non-clotting coat on the blood lines in kidney machines.
Inventors
- 👤 S Yen
- 👤 A Rembaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:27
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G18/329; A; A61; A61L; A61L33/00; A61L33/0005; A61L33/0011; A61L33/0023; C08G18/08; C08G18/0804; C08G18/0809; C08G18/0814; C08G18/10; C08G18/3275; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
11 words
A POLYMERIC SOLUTION CONSISTING ESSENTIALLY OF A POLYMER OF THE FORMULA:
Claim 2
Dependent Claim
11 words
A POLYMERIC SOLUTION CONSISTING ESSENTIALLY OF A POLYMER OF THE FORMULA:
Claim 3
Dependent Claim
57 words
A polymer solution according to claim 1 in which n is 10 to 1,000, A is halo, Z and Y are different members selected from the group consisting of isocyanate, hydroxyl, carboxyl and amino; and R3, R4 and R5 are selected from the group consisting of lower alkyl and hydrogen, and R and R2 are lower alkylene.
Claim 4
Dependent Claim
22 words
A polymer solution according to claim 2 in which Z and Y are selected from isocyanate and hydroxyl and ZY is urethane.
Claim 5
Dependent Claim
18 words
A polymer solution according to claim 1 in which the solvent is a mixture of dimethylformamide and diaminoheptane.
Claim 6
Dependent Claim
22 words
A polymer solution according to claim 2 in which R is ethylene, R2 is methylene and R3, R4 and R5 are methyl.
Claim 7
Independent Claim
22 words
A method of forming a cationic elastomeric polymer comprising the steps of forming a reaction mixture selected from the group consisting of:
Claim 8
Independent Claim
22 words
A method of forming a cationic elastomeric polymer comprising the steps of forming a reaction mixture selected from the group consisting of:
Claim 9
Dependent Claim
16 words
A method according to claim 6 in which said molecular weight is from 1,000 to 3,000.
Claim 10
Dependent Claim
40 words
A method according to claim 7 where R3 and R4 are lower alkyl, Z is isocyanate, Y is hydroxyl, ZY is urethane and R5A is selected from the group consisting of hydrohalic acids, lower alkyl sulfate or lower alkyl halide.
Claim 11
Dependent Claim
39 words
A method according to claim 8 in which said quaternization reaction is conduced in the presence at least a 100 percent stoichiometric excess of the R5A reagent in a common solvent for said intermediate polymer and said cationic polymer.
Claim 12
Dependent Claim
17 words
A method according to claim 6 in which said solvent is a mixture of dimethylformamide and diaminoheptane.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |