US3775401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha-aryl-succinimide-sulphonamide derivatives
Assignee: Ed Geistlich Soehne AG fuer Chemische Industrie
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Filing: 1971-08-04
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Granted: 1973-11-27
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Expires: 1991-08-04
Abstract
Abstract COMPOUNDS OF THE GENERAL FORMULA 1-R,2,5-DI(O=),3-R1,3-R2,4-R3,4-R4-PYRROLIDINE WHERE R REPRESENTS AN ARYL OR ARALIPHATIC GROUPS SUBSTITUTED IN THE AROMATIC RING WITH AT LEAST ONE SULPHONAMIDO GROUP, THE NITROGEN ATOM OF WHICH MAY BE JOINED TO A FURTHER RING SUBSTITUENT TO FORM A -CO-NHSO2CHAIN, AND R1, R2, R3 AND R4 ARE EACH H, ALKYL OF 1-5 CARBON ATOMS OR AN ARYL GROUP, AT LEAST ONE OF R1, R2, R3 AND R4 BEING AN ARYL GROUP AND PHYSIOLOGICALLY ACCEPTABLE SALTS THEREOF WITH BASES. THE COMPOUNDS ARE USEFUL IN THE TREATMENT OF EPILEPSY.
Inventors
- 👤 R Pfirrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:18
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/30; C07D207/34; C07D207/36; C07D207/40; C07D207/404; C07D207/408
Claims Analysis
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |