US3679629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for stabilizing polycarbonates and compositions made thereby
Assignee: General Electric Co
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Filing: 1971-04-01
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Granted: 1972-07-25
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Expires: 1991-04-01
Abstract
Abstract A METHOD IS PROVIDED FOR IMPROVING THE RESISTANCE OF POLYCARBONATE RESINS TO YELLOWING, RESULTING FROM MOLDING THE RESIN AT TEMPERATURES BETWEEN 500*F.-700*F. THERE IS UTILIZED AN EFFECTIVE AMOUNT OF AN ORGANOSILICON HYDRIDE SUCH AS TRIHEXYLSLANE. THERE ALSO IS PROVIDED POLYCARBONATE COMPOSITIONS MADE BY SUCH METHOD EXHIBITING STABILITY TOWARD COLOR CHANGE DURING MOLDING AND SUBSEQUENT FABRICATION.
Inventors
- 👤 Alan J Chalk
- 👤 Arnold Factor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:13
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08K5/5403
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |