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US2553685A
Expired / Lapsed
US
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Adsorption and elution of streptomycin
Assignee: Abbott Laboratories
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Filing: 1946-02-14
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Granted: 1951-05-22
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Expires: 1966-02-14
Abstract
No abstract record available.
Inventors
- 👤 Marvin A Spielman
- 👤 James E Rundell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:14
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
IN THE METHOD OF PURIFYING STREPTOMYCIN IN WHICH CRUDE STREPTOMYCIN IS ADSORBED ON SURFACEACTIVE CLAY, THE IMPROVEMENT WHICH CONSISTS IN ELUTING THE ADSORBED STREPTOMYCIN WITH AN AQUEOUS SOLUTION OF A SALT CONSISTING OF AN AMMONIUM BASE AND A WEAK ACID WHICH ARE VOLATILE IN STEAM AT TEMPERATURES AS LOW AS 50* C., AND REMOVING THE SALT FROM THE RESULTING STREPTOMYCIN SOLUTION BY DISTILLING THE AQUEOUS ELUATE UNDER REDUCED PRESSURE AT A TEMPERATURE NOT EXCEEDING 50* C.
References Cited (Backward Citations)
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US1048712A
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US1300747A
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US2104501A
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FR805092A
Cited
US2293954A
Cited
US2481267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |