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Patent US3681328A successfully refreshed from Google Patents.
US3681328A
Expired / Lapsed
US
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Sydnone derivatives of 7-aminocephalosporanic acids
Assignee: Astellas Pharma Inc
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Filing: 1967-06-27
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Granted: 1972-08-01
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Expires: 1987-06-27
Abstract
Abstract THE DISCLOSURE TEACHES NOVEL 3- AND/OR 4-SUBSTITUTED SYDNONE DERIVATIVES OF 7-AMINOCEPHALOSPORANIC ACIDS WHICH ARE USEFUL AS AN ANTIBACTERIAL AGENT IN THE TREATMENT OF THE INFECTIOUS DISEASES BY GRAM-NEGATIVE AND GRAM-POSITIVE ORGANISMS.
Inventors
- 👤 Masaru Kurita
- 👤 Yoshihisa Saito
- 👤 Tsutomu Teraji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:01
CPC Classifications
C; C07; C07D; C07D499/00
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |