US2541420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of streptomycin by carboxylic acid type ion exchange resins
Assignee: Rohm and Haas Co
•
Filing: 1949-01-08
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Granted: 1951-02-13
•
Expires: 1969-01-08
Abstract
No abstract record available.
Inventors
- 👤 Eugene E Howe
- 👤 Irving Putter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:58
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
THE PROCESS OF RECOVERING STREPTOMYCIN FROM AQUEOUS SOLUTIONS THEREOF, WHICH COMPRISES CONTACTING AN AQUEOUS SOLUTION OF STREPTOMYCIN WITH AN ION-EXCHANGE RESIN DERIVING ITS EXCHANGE CAPACITY ESSENTIALLY FROM CARBOXYLIC GROUPS, WHEREBY SAID STREPTOMYCIN IS ADSORBED ON SAID RESIN, AND THEN ELUTING SAID RESIN TO REMOVE THE ADSORBED STREPTOMYCIN.
Claim 2
Dependent Claim
47 words
THE PROCESS OF RECOVERING STREPTOMYCIN FROM AQUEOUS SOLUTIONS THEREOF, WHICH COMPRISES CONTACTING AN AQUEOUS SOLUTION OF STREPTOMYCIN WITH AN ION-EXCHANGE RESIN DERIVING ITS EXCHANGE CAPACITY ESSENTIALLY FROM CARBOXYLIC GROUPS, WHEREBY SAID STREPTOMYCIN IS ADSORBED ON SAID RESIN, AND THEN ELUTING SAID RESIN TO REMOVE THE ADSORBED STREPTOMYCIN.
References Cited (Backward Citations)
US2443485A
Cited
US2528022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |