US2537941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of streptomycin
Assignee: Pfizer Inc
•
Filing: 1946-06-04
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Granted: 1951-01-09
•
Expires: 1966-06-04
Abstract
No abstract record available.
Inventors
- 👤 Peter P Regna
- 👤 Isaiah A Solomons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:55
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A METHOD OF RECOVERING A STREPTOMYCIN HYDROHALIDE FROM A SALT SELECTED FROM THE GROUP CONSISTING OF STREPTOMYCIN SILICOTUNGSTATE AND STREPTOMYCIN PHOSPHOMOLYBDATE, WHICH COMPRISES SUBJECTING SAID SALT TO METATHESIS WITH AN AMINE HYDROHALIDE SELECTED FROM THE GROUP CONSISTING OF THE HYDROHALIDES OF TRIETHYLAMINE, DIMETHYLANILINE, DIETHYLANILINE, ETHYLENE DIAMINE, HEXAMETHYLENE TETRAMINE, QUINOLINE, PYRIDINE, ETHANOLAMINE AND MONOETHYLAMINE, IN A LOWER ALKANOL TO FORM AN INSOLUBLE AMINE SALT AND AN ALCHOLIC SOLUTION OF A STREPTOMYCIN HYDROHALIDE.
References Cited (Backward Citations)
US2501014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |