US3639655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hydroxy-substituted polyesters
Assignee: Phillips Petroleum Co
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Filing: 1969-03-21
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Granted: 1972-02-01
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Expires: 1989-03-21
Abstract
Abstract THEROMPLASTIC HYDROXY-SUBSTITUTED POLYESTERS ARE PREPARED BY REACTING A DIEPOXIDE WITH A DICARBOXYLIC ACID IN THE PRESENCE OF A POLAR ORGANIC SOLVENT AND A BASIC CATALYST.
Inventors
- 👤 Faber B Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4294; C08G18/64; C08G18/6407; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G63/00; C08G63/66; C08G63/668
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |