US2547640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolation of penicillin
Assignee: Wyeth Holdings LLC
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Filing: 1948-03-17
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Granted: 1951-04-03
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Expires: 1968-03-17
Abstract
No abstract record available.
Inventors
- 👤 Goldman Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:00
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS OF OBTAINING SUBSTITUTED AMMONIUM SALTS OF PENICULLIN FROM AQUEOUS SOLUTIONS THEREON WHICH COMPRISES THE STEPS OF PREPARING AN AQUEOUS SOLUTION OF PENICILLIN HAVING A PH WITHIN THE RANGE OF 4.5 TO 8.5 AND CONTAINING FROM ABOUT 5% TO 40% BY WEIGHT OF A SALTING OUT AGENT AND ADDING THERETO A LARGE STOICHIOMETRIC EXCESS, BASED ON THE PENICILLIN PRESENT IN SAID SOLUTION, OF AN ORGANIC AMINE HAVING A DISSOCIATION CONSTANT OF AT LEAST 1X10-5 WHILE MAINTAINING THE PH WITHIN THE RANGE 4.5 TO 8.5, THEREAFTER MIXING THE AQUEOUS SOLUTION CONTAINING THE RESULTING SUBSTITUTED AMMONIUM PENICILLIN SALT WITH A WATER IMMISCIBLE ORGANIC SOLVENT, SEPARATING THE ORGANIC SOLVENT FROM THE AQUEOUS PHASE AND RECOVERING FROM SAID ORGANIC SOLVENT THE SUBSTITUTED AMMONIUM SALT OF PENICILLIN.
Claim 2
Dependent Claim
123 words
A PROCESS OF OBTAINING SUBSTITUTED AMMONIUM SALTS OF PENICULLIN FROM AQUEOUS SOLUTIONS THEREON WHICH COMPRISES THE STEPS OF PREPARING AN AQUEOUS SOLUTION OF PENICILLIN HAVING A PH WITHIN THE RANGE OF 4.5 TO 8.5 AND CONTAINING FROM ABOUT 5% TO 40% BY WEIGHT OF A SALTING OUT AGENT AND ADDING THERETO A LARGE STOICHIOMETRIC EXCESS, BASED ON THE PENICILLIN PRESENT IN SAID SOLUTION, OF AN ORGANIC AMINE HAVING A DISSOCIATION CONSTANT OF AT LEAST 1X10-5 WHILE MAINTAINING THE PH WITHIN THE RANGE 4.5 TO 8.5, THEREAFTER MIXING THE AQUEOUS SOLUTION CONTAINING THE RESULTING SUBSTITUTED AMMONIUM PENICILLIN SALT WITH A WATER IMMISCIBLE ORGANIC SOLVENT, SEPARATING THE ORGANIC SOLVENT FROM THE AQUEOUS PHASE AND RECOVERING FROM SAID ORGANIC SOLVENT THE SUBSTITUTED AMMONIUM SALT OF PENICILLIN.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |