US3647786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cephalosporin sulfoxides
Assignee: Eli Lilly and Co
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Filing: 1968-10-03
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Granted: 1972-03-07
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Expires: 1988-10-03
Abstract
Abstract CEPHALOSPORINS ARE OXIDIZED TO THE CORRESPONDING CEPHALOSPORIN SULFOXIDES BY TREATMENT WITH AN INORGANIC PERACID HAVING A REDUCTION POTENTIAL OF AT LEAST +1.5 VOLTS AND CONTAINING ONLY NONMETALLIC ELEMENTS, ORGANIC CARBOXYLIC PERACIDS, OR MIXTURE OF HYDROGEN PEROXIDE AND AN ACID HAVING A DISSOCIATION CONSTANT OF AT LEAST 10**-5.
Inventors
- 👤 Robin D G Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:40
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/02; C07D501/04
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |