US3718644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antibiotic separation and purification
Assignee: Merck and Co Inc
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Filing: 1970-06-30
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Granted: 1973-02-27
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Expires: 1990-06-30
Abstract
Abstract A METHOD FOR THE RECOVERY AND PURIFICATION OF AN ANTIBIOTIC MIXTURE COMPRISING 7B-(D-5-AMINO-5-CARBOXYVALERAMIDO)-3-(A-METHOXY-P -SULFOOXYCINNAMOYLOXYMETHYL)7-METHOXY-3-CEPHEM-4-CARBOXYLIC ACID AND THE P-HYDROXY ANALOG THEREOF AND THE SEPARATION OF THOSE COMPONENTS FROM EACH OTHER.
Inventors
- 👤 R Weston
- 👤 I Putter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:40
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/57
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |