US3567685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer of a dihydric phenol and an imide
Assignee: General Electric Co
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Filing: 1969-08-26
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Granted: 1971-03-02
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Expires: 1989-08-26
Abstract
Abstract A COMPOSITION CONSISTING OF THE REACTION PRODUCT OF A DIHYDRIC PHENOL, A PARTICULAR IMIDE AND A CARBONYL HALIDE WHEREIN THE PARTICULAR IMIDE IS EITHER 2-(X-R-),5-(HOOC-)ISOINDOLINE-1,3-DIONE OR (5-(HOOC-)ISOINDOLINE-1,3-DION-2-YL)2-R OR MIXTURES THEREOF. IN THE FORMULAS, R IS DIVALENT HYDROCARBON RADICAL CONTAINING 1 TO 25 CARBON ATOMS AND X IS EITHER A CARBOXYL, A MERCAPTO, A HYDROXYL OR A SECONDARY AMINO GROUP.
Inventors
- 👤 Charles A Bialous
- 👤 Milton L Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:57
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/12; C08G63/00; C08G63/68; C08G63/685; C08G73/00; C08G73/06; C08G73/10; C08G73/16
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |