US3673272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymers of silicones with vinyl pyridine
Assignee: General Electric Co
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Filing: 1970-04-06
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Granted: 1972-06-27
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Expires: 1990-04-06
Abstract
Abstract Block copolymers of silicones with vinyl pyridine having the formula: WHEREIN A IS AT LEAST 25, B IS AT LEAST 10, C IS 1 OR MORE, AND R is selected from the class consisting of methyl and phenyl. 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 11:27
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: 4
Claim 1
Independent Claim
19 words
The block copolymer of claim 1 wherein a is 50 to 500, and b is from 10 to 500.
Claim 2
Dependent Claim
13 words
The block copolymer of claim 2 wherein c is from 3 to 10.
Claim 3
Dependent Claim
14 words
The block copolymer of claim 1 wherein the vinyl pyridine moiety is 2-vinyl pyridine.
Claim 4
Dependent Claim
10 words
The block copolymer of claim 1 wherein R is methyl.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |