Patent US3306879A successfully refreshed from Google Patents.
US3306879A
Expired / Lapsed
US
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Curable copolymers of tetrafluoroethylene
Assignee: EIDP Inc
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Filing: 1962-06-25
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Granted: 1967-02-28
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Expires: 1982-06-25
Abstract
No abstract record available.
Inventors
- 👤 Dexter B Pattison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:59
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/265; C08F214/267; B; B65; B65C; B65C3/00; B65C3/06; B65C3/08; B65C3/10; B65C3/12; C08F16/00; C08F16/12; C08F16/14; C08F16/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
30 words
A CURABLE ELASTOMERIC COPOLYMER COMPRISING (A) ABOUT 45 TO 55 MOLE PERCENT OF -CH2-CH2- UNITS, (B) ABOUT 54.8 TO 35 MOLE PERCENT OF UNITS SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
30 words
A CURABLE ELASTOMERIC COPOLYMER COMPRISING (A) ABOUT 45 TO 55 MOLE PERCENT OF -CH2-CH2- UNITS, (B) ABOUT 54.8 TO 35 MOLE PERCENT OF UNITS SELECTED FROM THE GROUP CONSISTING OF
Claim 3
Dependent Claim
27 words
A CURED ELASTOMERIC COPOLYMER OBTAINED BY MIXING AN ORGANIC POLYISOCYANATE AND THE CURABLE COPOLYMER OF CLAIM 1 WHEREIN X IS THE HYDROXYL GROUP AND HEATING SAID MIXTURE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |