US3709880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antibiotic purification process
Assignee: Merck and Co Inc
•
Filing: 1970-12-09
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Granted: 1973-01-09
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Expires: 1990-12-09
Abstract
Abstract FERMENTATION BROTHS OR IMPURE SOLUTIONS CONTAINING 7(D-5-AMINO-5-CARBOXYVALERAMIDO)-3-(CARBAMOYLOXYMETHYL)-7-METHOXY-3-CEPHEM-4-CARBOXYLIC ACID, A SUBSTANCE HAVING ANTIBIOTIC ACTIVITY AGAINST GRAM-NEGATIVE AND GRAM-POSITIVE MICROORGANISMS, ARE PURIFIED USING ION EX CHANGE RESINS OR ADSORBENTS SUCH AS ACTIVATED CARBON AND POLY-ACRYLAMIDE OR DEXTRAN GELS.
Inventors
- 👤 R Goegelman
- 👤 T Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:51
CPC Classifications
C; C07; C07D; C07D501/00; C07D501/14; C07D501/16; C07D501/20; C07D501/57; C07D501/02; C07D501/12
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |