US3732337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic crosslinked polyester material and method of molding
Assignee: Gulf Research and Development Co
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Filing: 1971-08-27
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Granted: 1973-05-08
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Expires: 1991-08-27
Abstract
Abstract A POLYANHYDRIDE, SUCH AS A COPOLYMER OF MALEIC ANHYDRIDE AND AN ALPHA-OLEFIN, WHEN HEATED TOGETHER WITH A POLYMERIC POLYOL, SUCH AS POLYVINYL ALCOHOL, YIELDS A POLYESTER CROSSLINKED MATERIAL. WHEN HEATED TO A TEMPERATURE IN EXCESS OF 80*C., THIS CROSSLINKED POLYESTER MATERIAL FLOWS AND CAN BE MOLDED. ON SLOW COOLING, THIS MATERIAL MAY AGAIN BECOME CROSSLINKED AND INSOLUBLE IN SOLVENTS SUCH AS ACETONE.
Inventors
- 👤 W Heilman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:08
CPC Classifications
C; C08; C08F; C08F8/00
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |