Patent US2198843A successfully refreshed from Google Patents.
US4138426A
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Alkyl perfluoro-ω-fluoroformyl esters and monomers therefrom
Assignee: EIDP Inc
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Filing: 1978-01-11
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Granted: 1979-02-06
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Expires: 1998-01-11
Abstract
Abstract Alkyl perfluoro-ω-fluoroformyl esters are provided which have the formula ##STR1## wherein R is alkyl of 1-6 carbon atoms, and N IS 0-6 (PREFERABLY 0). Compounds where n is 0 are prepared by contacting SO 3 with a compound of the formula ROOC--CF.sub.2 --CF.sub.2 --OR.sup.1. Compounds where n is 1-6 are prepared by contacting a compound where n is 0 with hexafluoropropylene oxide. Also provided are polymerizable monomers having the formula ##STR2## wherein Y is --COOR, --COOH, --COOM or --CN, where M is an alkali metal, ammonium or quaternary ammonium and p is 1-5, prepared from alkyl perfluoro-ω-fluoroformyl esters of this invention.
Inventors
- 👤 David C. England
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:25
CPC Classifications
C; C08; C08F; C08F16/00; C08F16/12; C08F16/14; C08F16/26; C07; C07C; C07C59/00; C07C59/40; C07C59/58; C07C59/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
41 words
A compound of the formula ##STR39## wherein Y is --COOR, --COOH, --COOM or --CN, R is an alkyl group of from 1 to 6 carbon atoms, M is an alkali metal, ammonium or quaternary ammonium, and p is 1 to 5.
Claim 2
Dependent Claim
41 words
A compound of the formula ##STR39## wherein Y is --COOR, --COOH, --COOM or --CN, R is an alkyl group of from 1 to 6 carbon atoms, M is an alkali metal, ammonium or quaternary ammonium, and p is 1 to 5.
Claim 3
Dependent Claim
9 words
The compound of claim 1 wherein Y is --COOR.
Claim 4
Dependent Claim
9 words
The compound of claim 1 wherein p is 1.
Claim 5
Dependent Claim
9 words
The compound of claim 2 wherein p is 1.
Claim 6
Dependent Claim
11 words
The compound of claim 2 wherein R is methyl or ethyl.
Claim 7
Dependent Claim
11 words
The compound of claim 4 wherein R is methyl or ethyl.
Claim 8
Dependent Claim
9 words
The compound of claim 5 wherein p is 2.
Claim 9
Dependent Claim
9 words
The compound of claim 1 wherein Y is --CN.
Claim 10
Dependent Claim
9 words
The compound of claim 8 wherein p is 1.
References Cited (Backward Citations)
US3852326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |