US2560889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of streptomycin from orange ii salt
Assignee: Pfizer Inc
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Filing: 1947-05-07
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Granted: 1951-07-17
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Expires: 1967-05-07
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 19:33
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN A PROCESS FOR THE PURIFICATION AND RECOVERY OF STREPTOMYCIN, THE STEPS OF MIXING A CRUDE STREPTOMYCIN-ORANGE II SALT WITH A SOLVENT OF THE GROUP CONSISTING OF ACETONE, METHANOL, PROPANOL AND ETHYLENE GLYCOL MONOMETHYL ETHER, REACTING SAID MIXTURE WITH AN AMINE SALT SELECTED FROM THE GROUP CONSISTING OF THE SULFATES, PHOSPHATES, OXALATES, CITRATES, MUCATES AND TARTRATES OF DIMETHYLANILINE, DIETHYLANILINE, ETHYLAMINE, TRIETHYLAMINE, QUINOLINE, PRYRIDINE AND ETHANOLAMINE, WHEREBY THE CORRESPONDING ACID SALT OF STREPTOMYCIN IS PRECIPITATED, AND SEPARATING SAID INSOLUBLE SALT OF STREPOMYCIN FROM THE RESULTING SOLUTION OF THE CORRESPONDING AMINE SALT OF ORANGE II.
Claim 2
Dependent Claim
93 words
IN A PROCESS FOR THE PURIFICATION AND RECOVERY OF STREPTOMYCIN, THE STEPS OF MIXING A CRUDE STREPTOMYCIN-ORANGE II SALT WITH A SOLVENT OF THE GROUP CONSISTING OF ACETONE, METHANOL, PROPANOL AND ETHYLENE GLYCOL MONOMETHYL ETHER, REACTING SAID MIXTURE WITH AN AMINE SALT SELECTED FROM THE GROUP CONSISTING OF THE SULFATES, PHOSPHATES, OXALATES, CITRATES, MUCATES AND TARTRATES OF DIMETHYLANILINE, DIETHYLANILINE, ETHYLAMINE, TRIETHYLAMINE, QUINOLINE, PRYRIDINE AND ETHANOLAMINE, WHEREBY THE CORRESPONDING ACID SALT OF STREPTOMYCIN IS PRECIPITATED, AND SEPARATING SAID INSOLUBLE SALT OF STREPOMYCIN FROM THE RESULTING SOLUTION OF THE CORRESPONDING AMINE SALT OF ORANGE II.
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) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |