Patent US3933767A successfully refreshed from Google Patents.
US3933767A
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US
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Cyanoperfluoroether acid fluorides and copolymers derived therefrom
Assignee: EIDP Inc
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Filing: 1974-05-22
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Granted: 1976-01-20
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Expires: 1994-05-22
Abstract
Abstract Disclosed herein are cyanoperfluoro(vinyl ethers), intermediate acid fluorides; a process for preparing the acid fluorides, and a process for preparing the vinyl ethers from acid fluoride and an alkali-metal carbonate. Also disclosed are copolymers incorporating units derived from the vinyl ethers as crosslinking constituents therein.
Inventors
- 👤 James E. Nottke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:08
CPC Classifications
C; C08; C08F; C08F16/00; C08F16/12; C08F16/14; C08F16/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
34 words
A copolymer of at least one cyanoperfluoro(vinyl ether) of the formula ##EQU7## where n is an integer from 0 to 4 and at least one member of the group vinylidene fluoride, tetrafluoroethylene, chlorotrifluoroethylene, hexafluoropropylene,
Claim 2
Dependent Claim
34 words
A copolymer of at least one cyanoperfluoro(vinyl ether) of the formula ##EQU7## where n is an integer from 0 to 4 and at least one member of the group vinylidene fluoride, tetrafluoroethylene, chlorotrifluoroethylene, hexafluoropropylene,
Claim 3
Dependent Claim
17 words
1,1,2,3-pentafluoropropylene and Cf 2 =cf--o--r f , where R f is perfluoroalkyl of one to three carbons.
Claim 4
Dependent Claim
17 words
1,1,2,3-pentafluoropropylene and Cf 2 =cf--o--r f , where R f is perfluoroalkyl of one to three carbons.
Claim 5
Dependent Claim
19 words
A polymer according to claim 1, comprising a copolymer of vinylidene fluoride, hexafluoropropylene, and at least one cyanoperfluoro(vinyl ether).
Claim 6
Dependent Claim
33 words
A polymer according to claim 1, comprising a copolymer of tetrafluoroethylene, CF 2 =CF--O--R f , wherein R f is perfluoroalkyl of from one to three carbons, and at least one cyanoperfluoro(vinyl ether).
References Cited (Backward Citations)
US3546186A
Cited
US3641104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |