US3812064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyanhydrides useful as flexibilizing curing agents for epoxy resins
Assignee: General Electric Co
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Filing: 1972-03-15
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Granted: 1974-05-21
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Expires: 1992-03-15
Abstract
Abstract RELATES TO POLYANHYDRIDES SUITABLE FOR USE AS FLEXIBILIZING CURING AGENTS FOR EPOXY RESINS. PREPARED BY REACTING ABIETIC ACID OR A DEHYDRATED CASTOR OIL FATTY ACID WITH MALEIC ANHYDRIDE, MALEIC ACID, METHYL MALEIC ACID, ITACONIC ANHYDRIDE OR FUMARIC ACID AND A HIGH MOLECULAR WEIGHT POLYOXYLENE POLYOL OR POLYOXYLENE POLYAMINE.
Inventors
- 👤 G Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:16
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4246; C08G59/4269
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |