Patent US3299019A successfully refreshed from Google Patents.
US3299019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydrofluorination of a copolymer of trifluoromethyl vinyl ether and tetrafluoroethylene
Assignee: EIDP Inc
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Filing: 1963-03-26
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Granted: 1967-01-17
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Expires: 1983-03-26
Abstract
No abstract record available.
Inventors
- 👤 Kealy Thomas Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:27
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS WHICH COMPRISES DYHYDROFLUORINATING A COPOLYMER WHICH CONSISTS ESSENTIALLY OF ABOUT 50 TO 75 MOLE PERCENT OF TRIFLUOROMETHYL VINYL ETHER UNITS AND ABOUT 25 TO 50 MOLE PERCENT OF TETRAFLUOROETHYLENE UNITS BY REACTION WITH FROM 20 TO 120 PARTS PER 100 PARTS OF COPOLYMER OF A NITROGEN BASE HAVING A KB OF AT LEAST 1X10**-5 AT A TEMPERATURE OF FROM 50 TO 100*C. FOR A PERIOD OF FROM 1 TO 12 HOURS, UNTIL SAID COPOLYMER EXHIBITS AN INFRARED ABSORPTION BAND AT 3.25 MICRONS WHICH HAS ABOUT 10-40% OF THE INTENSITY OF THE BAND AT 3.4 MICRONS.
Claim 2
Dependent Claim
97 words
A PROCESS WHICH COMPRISES DYHYDROFLUORINATING A COPOLYMER WHICH CONSISTS ESSENTIALLY OF ABOUT 50 TO 75 MOLE PERCENT OF TRIFLUOROMETHYL VINYL ETHER UNITS AND ABOUT 25 TO 50 MOLE PERCENT OF TETRAFLUOROETHYLENE UNITS BY REACTION WITH FROM 20 TO 120 PARTS PER 100 PARTS OF COPOLYMER OF A NITROGEN BASE HAVING A KB OF AT LEAST 1X10**-5 AT A TEMPERATURE OF FROM 50 TO 100*C. FOR A PERIOD OF FROM 1 TO 12 HOURS, UNTIL SAID COPOLYMER EXHIBITS AN INFRARED ABSORPTION BAND AT 3.25 MICRONS WHICH HAS ABOUT 10-40% OF THE INTENSITY OF THE BAND AT 3.4 MICRONS.
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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |