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US3578625A
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US
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Stabilized composition of polyphenylene oxide
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1968-08-29
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Granted: 1971-05-11
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Expires: 1988-08-29
Abstract
Abstract THE PRESENT COMPOSITION OF POLYPHENYLENE OXIDE HAS AN IMPROVED STABILITY AGAINST DETERIORATION OF QUALITY AND IN DISCOLORATION, AND COMPRISES A POLYPHENYLENE OXIDE, 0.005 TO 5/% BY WEIGHT OF AT LEAST ONE KIND OF HINDERED PHENOL AND 0.005 TO 5% BY WEIGHT OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF TRIALKYL PHOSPHITES, TRIARYL PHOSPHITES, TRIALKYL THIOPHOSPHITES, TRIARYL THIOPHOSPHITES, THIOPHOSPHITES, THIOETHERS OF CARBOXYLIC ACID ESTERS, THIOETHERS, METAL ALKYLDITHIOCARBAMATES AND METAL ARYLDITHIOCARBAMATES.
Inventors
- 👤 Seizo Nakashio
- 👤 Isao Maruta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:42
CPC Classifications
C; C08; C08K; C08K5/00
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 |