US3780031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing cephalosporin compounds
Assignee: Merck and Co Inc
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Filing: 1971-11-29
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Granted: 1973-12-18
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Expires: 1991-11-29
Abstract
Abstract A PROCESS FOR PREPARING 7-ACYLAMINO-7-METHOXY CEPHALOSPORINS IS PROVIDED WHICH COMPRISES REACTING A 7-IMINO7-METHOXY CEPHALOSPORIN WITH A SUBSTITUTED ACETIC ACID HALIDE, AND RECOVERING THE PRODUCT.
Inventors
- 👤 B Christensen
- 👤 W Leanza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:46
CPC Classifications
C; C07; C07C; C07C271/00; C07C271/06; C07C271/08; C07C271/10; C07C271/22; 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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |