US3578634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable copolycarbonate phosphite
Assignee: General Electric Co
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Filing: 1969-08-19
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Granted: 1971-05-11
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Expires: 1989-08-19
Abstract
Abstract A THERMALLY OXIDATIVELY STABLE COPOLYCARBONATE PHOSPHITE HAVING AN ELEMENTAL PHOSPHORUS CONTENT OF 0.0005 TO ABOUT 1.0 WEIGHT PERCENT BASED ON THE TOTAL WEIGHT OF THE POLYMER AND TO AN IMPROVED PROCESS FOR PREPARING THE POLYMER WHICH CONSISTS OF ADDING TO THE REACTION OF A DIHYDRIC PHENOL AND A CARBONATE PRECURSOR A PARTICULAR AMOUNT OF PHOSPHORUS TRIHALIDE SUCH AS PHOSPHORUS TRICHLORIDE.
Inventors
- 👤 Charles A Bialous
- 👤 Donald B G Jaquiss
- 👤 John J Keane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:30
CPC Classifications
C; C08; C08G; C08G64/00
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |