US3657186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyiminobenzoxazinediones and method of preparation
Assignee: EIDP Inc
•
Filing: 1970-08-26
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Granted: 1972-04-18
•
Expires: 1990-08-26
Abstract
Abstract A NOVEL POLYIMINOBENZOXAZINEDIONE COMPOSITION WHICH IS THE REACTION PRODUCT OF A MULTIFUNCTIONAL INOCYANATE AND A MULTIFUNCTIONAL AROMATIC O-HYDROXYNITRILE.
Inventors
- 👤 James M Craven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:06
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3838; C08G18/70; C08G18/72; C08G18/77
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |