US2631143A
Expired / Lapsed
US
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Purification of antibiotics with water soluble salts of water insoluble carboxylic acids
Assignee: Mathieson Chemical Corp
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Filing: 1947-07-19
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Granted: 1953-03-10
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Expires: 1967-07-19
Abstract
No abstract record available.
Inventors
- 👤 Braker William
- 👤 William A Lott
- 👤 O'keeffe Andrew Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:54
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238; A; A61; A61K; A61K31/00; A61K31/70; A61K31/7042; A61K31/7048
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
66 words
THE METHOD OF PURIFYING AN ANTIBIOTIC OF THE GROUP CONSISTING OF STREPTOMYCIN, DIHYDROSTREPTOMYCIN, STREPTOTHRICIN, AND WATER-SOLUBLE SALTS OF THESE WHICH COMPRISES TREATING AN AQUEOUS SOLUTION OF AN IMPURE ANTIBIOTIC OF THAT GROUP WITH A WATER-SOLUBLE SALT OF A SUBSTANTIALLY WATER-INSOLUBLE CARBOXYLIC ACID, RECOVERING THE PRECIPITATED SALT-TYPE COMBINATION OF THE ANTIBIOTIC AND THE CARBOXYLIC ACID, AND CONVERTING THE LATTER COMBINATION INTO A WATER-SOLUBLE SALT OF THE ANTIBIOTIC.
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) | 1956-03-09 | 1956-09-08 | 1957-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-09 | 1960-09-08 | 1961-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-09 | 1964-09-08 | 1965-03-10 | $7700.00 | Window Closed / Lapsed |