Patent US3875254A successfully refreshed from Google Patents.
US3875254A
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Block copolymers of silicones with vinyl pyridine
Assignee: General Electric Co
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Filing: 1971-12-29
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Granted: 1975-04-01
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Expires: 1991-12-29
Abstract
Abstract Block copolymers of silicones with vinyl pyridine having the formula: WHERE A IS AT LEAST 25, B IS AT LEAST 10, C IS 1 OR MORE, AND R is selected from monovalent hydrocarbon radicals, y is a whole number that varies from 1 to 12 and Z is an organo-functional substituent compatible with the vinyl pyridine system, and where X is a radical selected from the class consisting of chlorine, fluorine, iodine and bromine. The materials are useful for the formation of permselective membranes and allow the solubilization of silicones in a polar solvent.
Inventors
- 👤 John W Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:56
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; B; B01; B01D; B01D71/00; B01D71/06; B01D71/76; B01D71/80; C08G; C08G77/00; C08G77/42; C08G77/442; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/16; Y10S525/00; Y10S525/911; Y10S525/916; Y10S525/917; Y10S8/00; Y10S8/01
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
13 words
A BLOCK COPOLYMER OF QUATERNIZED VINYL PYRIDINE AND DIOGANOSILOXY UNITS HAVING THE FORMULA,
Claim 2
Dependent Claim
13 words
A BLOCK COPOLYMER OF QUATERNIZED VINYL PYRIDINE AND DIOGANOSILOXY UNITS HAVING THE FORMULA,
Claim 3
Dependent Claim
19 words
The block copolymer of claim 1 wherein a is 50 to 500, and b is from 50 to 500.
Claim 4
Dependent Claim
13 words
The block copolymer of claim 1 wherein c is from 3 to 10.
Claim 5
Dependent Claim
18 words
The block copolymer of claim 1 wherein R is selected from the class consisting of methyl and phenyl.
Claim 6
Dependent Claim
14 words
The block copolymer of claim 1 wherein the vinyl pyridine moiety is 2-vinyl pyridine.
Claim 7
Dependent Claim
22 words
The block copolymer of claim 1 wherein Z is DCOO- and D is an alkyl radical of 1 to 12 carbon atoms.
Claim 8
Dependent Claim
22 words
The block copolymer of claim 1 wherein Z is DO- and D is an alkyl radical of 1 to 12 carbon atoms.
Claim 9
Dependent Claim
22 words
The block copolymer of claim 1 wherein Z is D- and D is an alkyl radical of 1 to 12 carbon atoms.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |