Patent US3159677A successfully refreshed from Google Patents.
US3159677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorenamines and process for preparation thereof
Assignee: Parke Davis and Co LLC
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Filing: 1960-04-12
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Granted: 1964-12-01
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Expires: 1980-04-12
Abstract
No abstract record available.
Inventors
- 👤 Erik F Godefroi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:10
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/91; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71; C07C61/00; C07C61/16; C07C61/39; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A MEMBER OF THE CLASS CONSISTING OF FREE BASES OF THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
13 words
A MEMBER OF THE CLASS CONSISTING OF FREE BASES OF THE STRUCTURAL FORMULA
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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |