Patent US3794616A successfully refreshed from Google Patents.
US3794616A
Expired / Lapsed
US
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Heat stabilized compositions
Assignee: Dow Chemical Co
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Filing: 1971-03-29
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Granted: 1974-02-26
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Expires: 1991-03-29
Abstract
Abstract ANHYDRIDE-CONTAINING INTERPOLYMERS SUCH AS A COPOLYMER OF STYRENE AND MALEIC ANHYDRIDE MAY BE STABILIZED AGAINST THERMAL DEGRADATION BY MIXING THE POLYMER WITH ABOUT 0.01 TO 10 WEIGHT PERCENT OF AN ACID OF P, S, B OR SI.
Inventors
- 👤 K Dennis
- 👤 W Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:01
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/55
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |