Patent US3660485A successfully refreshed from Google Patents.
US3660485A
Expired / Lapsed
US
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Fluorene-9-carboxylic acid hydrazides
Assignee: GD Searle LLC
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Filing: 1970-10-05
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Granted: 1972-05-02
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Expires: 1990-10-05
Abstract
Abstract HYDRAZIDES OF 9-AMINOALKYL FLUORENE-9-CARBOXYLIC ACID ARE DESCRIBED HEREIN. GENERALLY, THESE COMPOUNDS ARE OBTAINED BY THE REACTION OF THE APPROPRIATE ESTER WITH HYDRAZINE. THE COMPOUNDS ARE USEFUL AGAINST BACTERIA, HELMINTHS, FUNGI, AND ALGAE. IN ADDITION, THEY ARE ANTIARRHYTHMIC AGENTS.
Inventors
- 👤 John W Cusic
- 👤 Chung Hwai Yen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:44
CPC Classifications
C; C07; C07C; C07C243/00; C07C243/24; C07C243/36; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/18
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |