US3728342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-acyloxymethyl cephalosporins and method of preparation
Assignee: Eli Lilly and Co
•
Filing: 1970-12-03
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Granted: 1973-04-17
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Expires: 1990-12-03
Abstract
Abstract 3-CYCLOALKYLCARBONYLOXYMETHYL AND 3-CYCLOALYLALKANOYLOXYMETHYL $3-CEPHALOSPORINS (E.G., 7-(2''-THIENYLACETAMIDO)-3-CYCLOBUTYLCARBONYLOXYMETHYL-$3-CEPHEM4-CARBOXYLIC ACID), ARE PREPARED BY REACTION OFA 7-ACYLAMIDO-$2-DESACETYLCEPHALOSPORIN WITH THE ANHYDRIDE OF AN ALIPHATIC CARBOXYLIC ACID TO FORM THE CORRESPONDING $2-ACYLOXYMETHYL CEPHALOSPORIN WHICH CAN BE OXIDIZED AND REDUCED TO FORM THE CORRESPONDING $3-COMPOUND.
Inventors
- 👤 S Kukolja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:52
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/24; C07D501/26
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |