Patent US2521349A successfully refreshed from Google Patents.
Patent US3767645A successfully refreshed from Google Patents.
US3767645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acylthioacetyl penicillins
Assignee: ER Squibb and Sons LLC
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Filing: 1971-09-14
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Granted: 1973-10-23
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Expires: 1991-09-14
Abstract
Abstract ACYLTHIOACETYLPENICILINS OF THE GENERAL FORMULA 6-(R2-CO-S-CH(-R1)-CO-NH-),2-(R-OOC-),3,3-DI(CH3-)PENAM WHEREIN R IS HYDROGEN, LOWER ALKYL, ARALKYL, TRI(LOWER ALKYL) SILYL, A SALT FORMING ION OR THE GROUP -CH2-OOC-R3 R1 IS HYDROGEN, LOWER ALKYL, CYCLOALKYL, ARALKYL, ARYL OR CERTAIN HETEROCYCLIC GROUPS; R2 IS LOWER ALKYL, CYCLOALKYL, ARYL OF CERTAIN HETEROCYCLIC GROUPS; AND R3 IS LOWER ALKYL, ARYL OR ARALKYL, ARE USEFUL AS ANTIBACTERIAL AGENTS.
Inventors
- 👤 U Treuner
- 👤 H Breuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:34
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |