US3674758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized tetrafluoroethylene-fluoroolefin copolymers having methyl ester end-groups and process for producing same
Assignee: EIDP Inc
•
Filing: 1968-04-01
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Granted: 1972-07-04
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Expires: 1988-04-01
Abstract
Abstract Stabilized tetrafluoroethylene-fluoroolefin copolymers having methyl ester end-groups are produced from tetrafluoroethylenefluoroolefin copolymers having carboxylic acid end-groups and acid fluoride end-groups by contacting the polymer with methanol at from about 65-200* C. for the carboxylic acid end-groups and from about 0-200* C. for the acid fluoride end-groups and then drying the stabilized polymer.
Inventors
- 👤 Dana Peter Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:29
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/14; C08F2810/00; C08F2810/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
The product of claim 1 in which the fluoroolefin monomer is hexafluoropropylene.
Claim 2
Dependent Claim
14 words
The product of claim 1 in which the fluoroolefin mOnomer is perfluoromethyl perfluorovinyl ether.
Claim 3
Dependent Claim
14 words
The product of claim 1 in which the fluoroolefin monomer is perfluoroethyl perfluorovinyl ether.
Claim 4
Dependent Claim
14 words
The product of claim 1 in which the fluoroolefin monomer is perfluoropropyl perfluorovinyl ether.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |