US3817951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-modulus thermoplastic ethylene-tetrafluoroethylene-hexafluoropropene terpolymers
Assignee: Arkema Inc
•
Filing: 1972-11-20
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Granted: 1974-06-18
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Expires: 1992-11-20
Abstract
Abstract A low-modulus, nonelastic, thermoplastic terpolymer composed of copolymerized units (in mole percent) of 40 to 60% ethylene, 20 to 30% tetrafluoroethylene, and 10 to 30% hexafluoropropene.
Inventors
- 👤 D Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:02
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
19 words
A tErpolymer according to claim 1 wherein the molar ratio of ethylene:tetrafluoroethylene:hexafluoropropylene is in the range 1.7:1:1 to 2:1:1
Claim 2
Dependent Claim
15 words
A terpolymer according to claim 1 composed of 50% ethylene, 23% tetafluoroethylene and 27% hexafluoropropylene.
Claim 3
Dependent Claim
15 words
A terpolymer according to claim 1 composed of 50% ethylene, 30% tetrafluoroethylene and 20% hexafluoropropylene.
References Cited (Backward Citations)
US2468664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |