Patent US2643251A successfully refreshed from Google Patents.
US2643251A
Expired / Lapsed
US
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Precipitation of fine particle procaine penicillin g
Assignee: Bristol Laboratories Inc
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Filing: 1950-03-29
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Granted: 1953-06-23
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Expires: 1970-03-29
Abstract
No abstract record available.
Inventors
- 👤 Frank W Staab
- 👤 John M Kolbas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:13
CPC Classifications
C; C07; C07D; C07D499/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE METHOD OF PRODUCING CRYSTALS OF PROCAINE PENICILLINS OF HIGH THERAPEUTIC POTENCY HAVING A PARTICLE SIZE WITHIN THE RANGE OF FROM 1 TO 5 MICRONS WHICH COMPRISES THE STEPS OF DISSOLVING A PROCAINE PENICILLIN IN ONE VOLUME OF METHANOL AT A TEMPERATURE OF 35 TO 40* C., ADDING THE WARM METHANOL SOLUTION OF PROCANINE PENICILLIN TO 5 TO 15 VOLUMES OF CARBON TETRACHLORIDE HAVING A TEMPPERATURE OF BETWEEN 0 TO 10* C., MILDLY AGITATING THE MIXTURE TO PRECIPITATE CRYSTALS OF THE PROCAINE PENICILLIN HAVING A PARTICLE SIZE OF FROM 1 TO 5 MICRONS, AND SEPARATING AND DRYING THE FINE PARTICLE SIZE CRYSTALLINE PRODUCT.
Claim 2
Independent Claim
103 words
THE METHOD OF PRODUCING CRYSTALS OF PROCAINE PENICILLINS OF HIGH THERAPEUTIC POTENCY HAVING A PARTICLE SIZE WITHIN THE RANGE OF FROM 1 TO 5 MICRONS WHICH COMPRISES THE STEPS OF DISSOLVING A PROCAINE PENICILLIN IN ONE VOLUME OF METHANOL AT A TEMPERATURE OF 35 TO 40* C., ADDING THE WARM METHANOL SOLUTION OF PROCANINE PENICILLIN TO 5 TO 15 VOLUMES OF CARBON TETRACHLORIDE HAVING A TEMPPERATURE OF BETWEEN 0 TO 10* C., MILDLY AGITATING THE MIXTURE TO PRECIPITATE CRYSTALS OF THE PROCAINE PENICILLIN HAVING A PARTICLE SIZE OF FROM 1 TO 5 MICRONS, AND SEPARATING AND DRYING THE FINE PARTICLE SIZE CRYSTALLINE PRODUCT.
References Cited (Backward Citations)
US2515898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |