Patent US2534058A successfully refreshed from Google Patents.
US2534058A
Expired / Lapsed
US
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Polymerization of tetrafluoroethylene with dibasic acid peroxide catalysts
Assignee: EIDP Inc
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Filing: 1946-11-30
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Granted: 1950-12-12
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Expires: 1966-11-30
Abstract
No abstract record available.
Inventors
- 👤 Renfrew Malcolm Mackenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:46
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
PROCESS OF PREPARING A SUSPENSOID OF POLYTETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING TETRAFLUOROETHYLENE AT A TEMPERATURE OF 0 DEGREE C TO 95*C. UNDER A PRESSURE OF AT LEAST 15 LBS. PER SQ. IN. WITH AN AQUEOUS SOLUTION OF A PEROXIDE OF A SATURATED ALIPHATIC DIBASIC ACID HAVING 4 TO 5 CARBON ATOMS, INCLUSIVE.
Claim 2
Dependent Claim
51 words
PROCESS OF PREPARING A SUSPENSOID OF POLYTETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING TETRAFLUOROETHYLENE AT A TEMPERATURE OF 0 DEGREE C TO 95*C. UNDER A PRESSURE OF AT LEAST 15 LBS. PER SQ. IN. WITH AN AQUEOUS SOLUTION OF A PEROXIDE OF A SATURATED ALIPHATIC DIBASIC ACID HAVING 4 TO 5 CARBON ATOMS, INCLUSIVE.
References Cited (Backward Citations)
US2319576A
Cited
US2394243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |