US3516970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct synthesis of polymeric schiff bases from two amines and two aldehydes
Assignee: National Aeronautics and Space Administration
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Filing: 1966-11-09
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Granted: 1970-06-23
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Expires: 1986-11-09
Abstract
No abstract record available.
Inventors
- 👤 Gaetano F D Alelio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:27
CPC Classifications
C; C08; C08G; C08G73/00; C08G12/00; C08G12/02; C08G12/04; C08G12/06; C08G12/08; C08L; C08L75/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3340232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |