US3419561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2,3,4,4a,5,6,10b-heptahydro-1-oxaphenanthridines and production thereof
Assignee: AH Robins Co Inc
•
Filing: 1965-10-23
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Granted: 1968-12-31
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Jenkins Herndon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:59
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/04; C07D309/00; C07D309/02; C07D309/08; C07D309/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3121086A
Cited
US3313818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |