US3591585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making desacetoxycephalosporins
Assignee: Eli Lilly and Co
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Filing: 1969-02-14
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Granted: 1971-07-06
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Expires: 1989-02-14
Abstract
Abstract DESACETOXYCEPHALOSPORIN ESTERS, USEFUL IN PREPARING CEPHALOSPORIN ANTIBIOTICS, E.G. CEPHALEXIN, ARE PREPARED IN IMPROVED YIELDS BY HEATING A PENICILLIN SULFOXIDE ESTER DISSOLVED IN A TERTIARY CARBOXAMIDE CONTAINING SOLVENT IN THE PRESENCE OF SULFONIC ACID WHILE PROVIDING A MEANS FOR REMOVING OR INACTIVATING WATER IN THE REACTION MIXTURE.
Inventors
- 👤 Lowell D Hatfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:33
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |