US3489696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing polyimides from isocyanates and polycarboxylic acids
Assignee: Bayer Corp
•
Filing: 1966-10-06
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Granted: 1970-01-13
•
Expires: 1986-10-06
Abstract
No abstract record available.
Inventors
- 👤 Gerald W Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:28
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/1064; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G18/343; C08G18/346; C08G18/38; C08G18/3855; C08G18/3863; C08G18/3865; C08G18/3872; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8048; C08G73/1003; C08G73/1035; C08L; C08L69/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3300420A
Cited
US3314923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |