US3704235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable free radicals of the nitroxide type derived from tropane ring compounds
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1971-01-11
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Granted: 1972-11-28
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Expires: 1991-01-11
Abstract
Abstract FREE RADICALS OF THE NITROXIDE TYPE CONSTITUTED BY NITROGENOUS BICYCLIC COMPOUNDS HAVING THE GENERAL FORMULA: 1-R1,2-R2,2-R''2,3-R3,3-R''3,4-R4,4-R''4,5-R5,6-R6,6-R''6, 7-R7,7-R''7-NORTROPANE-8-OXIDE IN WHICH R1,R2,R''2,R4,R''4,R5,R6,R''6,R7 AND R''7 ARE SELECTED FROM THE GROUP FORMED BY HYDROGEN ATOMS AND ORGANIC RADICALS AND R3 AND R''3 ARE SELECTED FROM THE GROUP FROMED BY TWO HYDROGEN ATOMS, THE GROUPS OH, NH2, N-OH, N-NH2, -COOH, -COOH, -CONH2 OR CONSTITUTE WITH THE ATOM C OF THE RING THE KETONE GROUP -C=O.
Inventors
- 👤 Andre Rassat
- 👤 Jacques Ronzaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:30
CPC Classifications
C; C07; C07D; C07D451/00; C07D451/02; C07D451/04; C07D451/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |