US4131740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkyl perfluoro-ω-fluoroformyl esters and their preparation
Assignee: EIDP Inc
•
Filing: 1977-04-20
•
Granted: 1978-12-26
•
Expires: 1997-04-20
Abstract
Abstract Alkyl perfluoro- omega -fluoroformyl esters are provided which have the formula: <IMAGE> wherein R is alkyl of 1-6 carbon atoms, and n is 0-6 (preferably 0).
Inventors
- 👤 David C. England
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:25
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: 7
Claim 1
Independent Claim
18 words
A compound of the formula: ##STR23## wherein R is alkyl of 1-6 carbon atoms, and n is 1-6.
Claim 2
Dependent Claim
18 words
A compound of the formula: ##STR23## wherein R is alkyl of 1-6 carbon atoms, and n is 1-6.
Claim 3
Dependent Claim
11 words
The compound of claim 1 wherein R is methyl or ethyl.
Claim 4
Dependent Claim
41 words
A process for preparing a compound of the formula ##STR24## wherein R is alkyl of 1-6 carbon atoms, and m is 1-6, comprising: contacting a compound of the formula ROOC--CF 2 --COF where R is as defined above with hexafluoropropylene oxide.
Claim 5
Dependent Claim
41 words
A process for preparing a compound of the formula ##STR24## wherein R is alkyl of 1-6 carbon atoms, and m is 1-6, comprising: contacting a compound of the formula ROOC--CF 2 --COF where R is as defined above with hexafluoropropylene oxide.
Claim 6
Dependent Claim
19 words
The process of claim 3 wherein the contacting is carried out in the presence of fluoride ion as catalyst.
Claim 7
Dependent Claim
54 words
The process of claim 4 wherein the fluoride ion is from a fluoride compound selected from the group consisting of alkali metal fluorides, ammonium fluoride and tetraalkyl-ammonium fluorides where the alkyl is of 1-4 carbon atoms, said fluoride compound being contained in an inert liquid diluent in which the fluoride compound is partly soluble.
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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |