US3778432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isocyanates and carbamates of penicillins and 3-cephem-4-carboxylic acids
Assignee: Merck and Co Inc
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Filing: 1971-12-13
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Granted: 1973-12-11
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Expires: 1991-12-13
Abstract
Abstract PREPARATION OF 6-AMINO-6-METHOXY PENICILLINS AND 7AMINO-7-METHOXY-3-CEPHEM-4-CARBOXYLIC ACID AND ITS ESTERS WHICH ARE USEFUL AS INTERMEDIATES IN THE PRODUCTION OF THE ANTIBIOTICS 7-ACYLAMIDO-7-METHOXY-3-CEPHEM-4-CARBOXYLIC ACID AND ITS ESTERS AND SALTS. THE PRODUCTS ARE PREPARED BY REMOVAL OF THE SUBSTITUTED OXYCARBONYL GROUP FROM A 6(OR 7)-SUBSTITUTED OXYCARBONYLAMINO-6(OR 7)METHOXY COMPOUND BY REDUCTION EMPLOYING A CHEMICAL, CATALYTIC OR PHOTOCHEMICAL METHOD UNDER NON-ACIDIC CONDITIONS.
Inventors
- 👤 S Pines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:34
CPC Classifications
C; C07; C07D; C07D499/00
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |