US3062793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous copolymers of hexafluoropropylene and tetrafluoroethylene and their preparation
Assignee: EIDP Inc
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Filing: 1958-12-29
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Granted: 1962-11-06
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Expires: 1978-12-29
Abstract
No abstract record available.
Inventors
- 👤 Eleuterio Herbert Sousa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:30
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
104 words
A PROCESS FOR THE PREPARATION OF NORMALLY SOLID, NORMALLY AMORPHOUS INTERPOLYMERS OF HEXAFLUOROPROPYL ENE AND TETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING A MIXTURE OF 70 TO 99 WEIGHT PERCENT HEXAFLUOROPPYLENE AND 1 TO 30% COMPLEMENTALLY OF TETRAFLUOROETHYLENE AT A TEMPERATURE OF 70 TO 350*C. AND A PRESSURE OF AT LEAST 2000 ATMOSPHERES WITH 0.001 TO 5% BASED ON THE WEIGHT OF MONOMERS CHARGED OF POLYMERIZATION INITIATOR SELECTED FROM THE GROUP CONSISTING OF OXYGEN , PERFLIOROCARBON PEROXIDES,PERFLUOROCARBON DISULFIDES, PERFLUOROCARBON THIOMERCURY COMPOUNDS, PERFLUORONITROGEN COMPOUNDS AND FLUORIDES OF VARIABLE VALENCE METAL IN WHICH THE METAL HAS AN OXIDATION POTENTIAL HIGHER THAN MERCURY AND IS IN ITS HIGHEST VALENCY STATE.
Claim 2
Dependent Claim
104 words
A PROCESS FOR THE PREPARATION OF NORMALLY SOLID, NORMALLY AMORPHOUS INTERPOLYMERS OF HEXAFLUOROPROPYL ENE AND TETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING A MIXTURE OF 70 TO 99 WEIGHT PERCENT HEXAFLUOROPPYLENE AND 1 TO 30% COMPLEMENTALLY OF TETRAFLUOROETHYLENE AT A TEMPERATURE OF 70 TO 350*C. AND A PRESSURE OF AT LEAST 2000 ATMOSPHERES WITH 0.001 TO 5% BASED ON THE WEIGHT OF MONOMERS CHARGED OF POLYMERIZATION INITIATOR SELECTED FROM THE GROUP CONSISTING OF OXYGEN , PERFLIOROCARBON PEROXIDES,PERFLUOROCARBON DISULFIDES, PERFLUOROCARBON THIOMERCURY COMPOUNDS, PERFLUORONITROGEN COMPOUNDS AND FLUORIDES OF VARIABLE VALENCE METAL IN WHICH THE METAL HAS AN OXIDATION POTENTIAL HIGHER THAN MERCURY AND IS IN ITS HIGHEST VALENCY STATE.
Claim 3
Dependent Claim
45 words
HEXAFLUOROPROPYLENE/TETRAFLUOROETHYLENE INTERPOLYMER OBTAINED BY THE PROCESS OF CLAIM 1, FURTHER CHARACTERIZED IN THAT UPON BEING HEATED TO A TEMPERATURE ON THE ORDER OF 300*C. AND ALLOWED TO COOL IN AIR TO ROOM TEMPERATURE, SAID INTERPOLYMER IS SOLID, TRANSPARENT, AND COMPLETELY AMORPHOUS AS DETERMINED BY X-RAY.
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) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |