US3252973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acylation via carbodimides for penicillin and cephalosporin preparation
Assignee: Eli Lilly and Co
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Filing: 1962-10-08
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Granted: 1966-05-24
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Expires: 1982-10-08
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Flynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:22
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR PREPARING AN ANTIBIOTIC SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF THE PENICILLINS AND THE CEPHALOSPORINS, WHICH COMPRISES PREPARING A SOLUTION OF 6-AMINOPENICILLANIC ACID OR 7-AMINIOCEPHALOSPORANIC ACID AND AT LEAST ABOUT AN EQUIMOLAR PROPORTION OF THE MONOCARBOXYLIC ACID CORRESPONDING TO THE ACYLAMIDO MOIETY OF SAID ANTIBIOTIC SUBSTANCE IN AN AQUEOUS, INERT MUTUAL SOLVENT THEREFOR, ADDING THERETO A SOLUTION OF A CARBODIIMIDE IN AT LEAST EQUIMOLAR PROPORTION TO SAID 6-AMINOPENCILLANIC ACID OR 7-AMINOCEPHALOSPORANIC ACID, SAID CARBODIIMIDE HAVING THE STRUCTURE
Claim 2
Dependent Claim
80 words
A PROCESS FOR PREPARING AN ANTIBIOTIC SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF THE PENICILLINS AND THE CEPHALOSPORINS, WHICH COMPRISES PREPARING A SOLUTION OF 6-AMINOPENICILLANIC ACID OR 7-AMINIOCEPHALOSPORANIC ACID AND AT LEAST ABOUT AN EQUIMOLAR PROPORTION OF THE MONOCARBOXYLIC ACID CORRESPONDING TO THE ACYLAMIDO MOIETY OF SAID ANTIBIOTIC SUBSTANCE IN AN AQUEOUS, INERT MUTUAL SOLVENT THEREFOR, ADDING THERETO A SOLUTION OF A CARBODIIMIDE IN AT LEAST EQUIMOLAR PROPORTION TO SAID 6-AMINOPENCILLANIC ACID OR 7-AMINOCEPHALOSPORANIC ACID, SAID CARBODIIMIDE HAVING THE STRUCTURE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |