US2540284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatographic purification of streptomycin and streptothricin hydrochloride
Assignee: Merck and Co Inc
•
Filing: 1945-06-23
•
Granted: 1951-02-06
•
Expires: 1965-06-23
Abstract
No abstract record available.
Inventors
- 👤 Robert L Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:58
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238; C12; C12N; C12N1/00; C12N1/20; C12N1/205; C12P; C12P19/00; C12P19/26; Y; Y10; Y10S; Y10S435/00; Y10S435/814; Y10S435/815
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE PROCESS FOR PURIFYING A CRUDE ANTIBIOTIC ACID SALT OF THE CLASS CONSISTING OF HYDROCHLORIDES OF THE WATER SOLUBLE BASIC ACTINOMYCES ELABORATION PRODUCTS STREPTOMYCIN AND STREPTOTHRICIN, THAT COMPRISES ADDING A METHANOLIC SOLUTION OF THE ANTIBIOTIC ACID SALT TO A COLUMN OF ADSORBENT MATERIAL SELECTED FROM THE GROUP CONSISTING OF ACID WASHED ALUMINA AND ACTIVATED CHARCOAL, WASHING THE COLUMN WITH A METHANOLIC SOLVENT TO DEVELOP IN THE COLUMN ZONES OF ADSORBENT MATERIAL CONTAINING THE ANTIBIOTIC ACID SALT IN DIFFERING AMOUNTS AND DIFFERING DEGREES OF PURITY, AND SELECTIVELY RECOVERING THE ANTIBIOTIC ACID SALT FROM SAID ZONES OF ADSORBENT MATERIAL BY ELUTION WITH A METHANOLIC SOLVENT.
Claim 2
Dependent Claim
103 words
THE PROCESS FOR PURIFYING A CRUDE ANTIBIOTIC ACID SALT OF THE CLASS CONSISTING OF HYDROCHLORIDES OF THE WATER SOLUBLE BASIC ACTINOMYCES ELABORATION PRODUCTS STREPTOMYCIN AND STREPTOTHRICIN, THAT COMPRISES ADDING A METHANOLIC SOLUTION OF THE ANTIBIOTIC ACID SALT TO A COLUMN OF ADSORBENT MATERIAL SELECTED FROM THE GROUP CONSISTING OF ACID WASHED ALUMINA AND ACTIVATED CHARCOAL, WASHING THE COLUMN WITH A METHANOLIC SOLVENT TO DEVELOP IN THE COLUMN ZONES OF ADSORBENT MATERIAL CONTAINING THE ANTIBIOTIC ACID SALT IN DIFFERING AMOUNTS AND DIFFERING DEGREES OF PURITY, AND SELECTIVELY RECOVERING THE ANTIBIOTIC ACID SALT FROM SAID ZONES OF ADSORBENT MATERIAL BY ELUTION WITH A METHANOLIC SOLVENT.
References Cited (Backward Citations)
US2378876A
Cited
US2501014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |