US3729440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable polycarbonate
Assignee: General Electric Co
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Filing: 1971-01-04
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Granted: 1973-04-24
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Expires: 1991-01-04
Abstract
Abstract A THERMALLYY STABLE AROMATIC POLYCARBONATE COMPOSITION WHICH IS STABILIZED WITH A MINOR AMOUNT OF A PHOSPHINITE, WHICH PHOSPHINITE HAS THE GENERAL FOLLOWING FORMULA: R1-P(-R4)-O-R3 PREFERABLY, THE PHOSPHINITE IS ETHYL DIPHENYL PHOSPHINITE. THE COMPOSITION MAY ALSO HAVE INCLUDED WITH IT AN EPOXY COMPOUND HAVING THE FOLLOWING FORMULA: O<(-C(-R4)(-R5)-C(-R6)(-R7)-)
Inventors
- 👤 F Liberty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:21
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5377
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |