US2754295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of streptomycin
Assignee: Bristol Laboratories Inc
•
Filing: 1953-04-20
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Granted: 1956-07-10
•
Expires: 1973-04-20
Abstract
No abstract record available.
Inventors
- 👤 Oliver B Fardig
- 👤 Kaplan Murray Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:11
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN THE PROCESS OF ADSORBING AN ALKALINE-REACTING, NITROGEN-BASIC, ANTIBIOTIC ELABORATION PRODUCT OF A MICROORGANISM ON AND ELUTING IT FROM A COLUMN OF A CARBOXYLIC ION EXCHANGE RESIN, THE STEP INTERMEDIATE TO ADSORPTION AND ELUTION COMPRISING WASHING THE COLUMN OF ADSORBED ANTIBIOTIC WITH AN AQUEOUS SOLUTION OF AN AMINE SALT, SAID AMINE SALT BEING FORMED FROM AN AMINE WHICH IS CAPABLE OF FORMING AN ALCOHOL-SOLUBLE SULFATE.
Claim 2
Dependent Claim
65 words
IN THE PROCESS OF ADSORBING AN ALKALINE-REACTING, NITROGEN-BASIC, ANTIBIOTIC ELABORATION PRODUCT OF A MICROORGANISM ON AND ELUTING IT FROM A COLUMN OF A CARBOXYLIC ION EXCHANGE RESIN, THE STEP INTERMEDIATE TO ADSORPTION AND ELUTION COMPRISING WASHING THE COLUMN OF ADSORBED ANTIBIOTIC WITH AN AQUEOUS SOLUTION OF AN AMINE SALT, SAID AMINE SALT BEING FORMED FROM AN AMINE WHICH IS CAPABLE OF FORMING AN ALCOHOL-SOLUBLE SULFATE.
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) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |