US3594370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 7-aminocephalosporanic acid
Assignee: Eli Lilly and Co
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Filing: 1969-05-15
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Granted: 1971-07-20
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Expires: 1989-05-15
Abstract
Abstract IN THE PREPARATION OF 7-AMINOCEPHALOSPORANIC ACID (7-ACA) BY THE CHEMICAL DEACYLATION OF CEPHALOSPORIN C AND SALTS THEREOF WITH NITROSYL CHLORIDE AND RECOVERY OF 7-ACA BY THE EVAPORATION OF THE SOLVENTS, INCREASED YIELDS ARE OBTAINED BY THE ADDITION, PRIOR TO THE EVAPORATION OF THE SOLVENTS, OF A SUBSTANCE THAT DESTROYS EXCESS NITROSYL CHLORIDE AND DECREASES UNDERSIRABLE SIDE REACTIONS.
Inventors
- 👤 Harvey M Higgins Jr
- 👤 Thomas W Mcintyre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:10
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/18
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |