US2560891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amine salt precipitants for antibiotic bases
Assignee: Pfizer Inc
•
Filing: 1948-12-16
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Granted: 1951-07-17
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Expires: 1968-12-16
Abstract
No abstract record available.
Inventors
- 👤 Peter P Regna
- 👤 Isaiah A Solomons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:58
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/238
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS FOR THE PURIFICATION AND RECOVERY OF AN ALKALINE-REACTING, NITROGEN-BASIC, ANTIBIOTIC ELABORATION PRODUCT OF A MICROORGANISM, THE STEP OF SUBJECTING A CRUDE SOLUTION OF A SALT OF SUCH ANTIBIOTIC ELABORATION PRODUCT IN A LOWER ALIPHTIC ALCOHOL HAVING FROM 1 TO 4 CARBON ATOMS TO METATHESIS BY ADDING TO SUCH SOLUTION A SOLUBLE AMINE SALT SELECTED FROM THE GROUP CONSISTING OF THE SULFATES, PHOSPHATES, CITRATES, OXALATES, TARTRATES, SUCCINATES, ADIPATES, GLUTARATES, MALEATES, FUMARATES AND MUCATES, WHEREBY A CORRESPONDING SALT OF SAID ELABORATION PRODUCT IS SELECTIVELY PRECIPITATED FROM THE SOLUTION.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR THE PURIFICATION AND RECOVERY OF AN ALKALINE-REACTING, NITROGEN-BASIC, ANTIBIOTIC ELABORATION PRODUCT OF A MICROORGANISM, THE STEP OF SUBJECTING A CRUDE SOLUTION OF A SALT OF SUCH ANTIBIOTIC ELABORATION PRODUCT IN A LOWER ALIPHTIC ALCOHOL HAVING FROM 1 TO 4 CARBON ATOMS TO METATHESIS BY ADDING TO SUCH SOLUTION A SOLUBLE AMINE SALT SELECTED FROM THE GROUP CONSISTING OF THE SULFATES, PHOSPHATES, CITRATES, OXALATES, TARTRATES, SUCCINATES, ADIPATES, GLUTARATES, MALEATES, FUMARATES AND MUCATES, WHEREBY A CORRESPONDING SALT OF SAID ELABORATION PRODUCT IS SELECTIVELY PRECIPITATED FROM THE SOLUTION.
References Cited (Backward Citations)
US2462175A
Cited
US2501014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 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 |