US2653151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of streptomycin
Assignee: Heyden Chemical Corp
•
Filing: 1950-02-17
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Granted: 1953-09-22
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Expires: 1970-02-17
Abstract
No abstract record available.
Inventors
- 👤 Sokol Herman
- 👤 Robert P Popino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:41
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
THE PROCESS OF PURIFYING CRUDE WATER SOLUBLE STREPTOMYCIN HYDROCHLORIDE WHICH COMPRISES CONTACTING SAID STREPTOMYCIN HYDROCHLORIDE DISSOLVED IN A WATER-MISCIBLE ORGANIC SOLVENT CONTAINING WATER WITH AN ACIDIFIED ALUMINA ADSORPTION COLUMN HAVING A PH OF FROM 3.0 TO 4.0 AND THEN RECOVERING PURIFIED STREPTOMYCIN FROM THE COLUMN EFFLUENT.
Claim 2
Dependent Claim
46 words
THE PROCESS OF PURIFYING CRUDE WATER SOLUBLE STREPTOMYCIN HYDROCHLORIDE WHICH COMPRISES CONTACTING SAID STREPTOMYCIN HYDROCHLORIDE DISSOLVED IN A WATER-MISCIBLE ORGANIC SOLVENT CONTAINING WATER WITH AN ACIDIFIED ALUMINA ADSORPTION COLUMN HAVING A PH OF FROM 3.0 TO 4.0 AND THEN RECOVERING PURIFIED STREPTOMYCIN FROM THE COLUMN EFFLUENT.
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) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |