US3814754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleavage of 7-acylamino cephalosporins
Assignee: Eli Lilly and Co
•
Filing: 1971-06-10
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Granted: 1974-06-04
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Expires: 1991-06-10
Abstract
Abstract TRICHLOROETHYL AND P-NITROBENZYL ESTERS OF 3-METHYL-7ACYLAMIDO CEPHALOSPORINS ARE CONVERTED TO THE CORRESPONDING 3-METHYL-7-AMINO ESTERS BY TREATMENT WITH WATER OR A LOWER ALKANOL IN THE PRESENCE OF A STRONG ACID.
Inventors
- 👤 B Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:17
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |