US2914524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining process for vitamin b
Assignee: Wyeth Holdings LLC
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Filing: 1957-03-18
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Granted: 1959-11-24
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Expires: 1977-03-18
Abstract
No abstract record available.
Inventors
- 👤 William M Ziegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:11
CPC Classifications
C; C07; C07H; C07H23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS OF PURIFYING VITAMIN B12 IN AN IMPURE AQUEOUS VITAMIN B12-CONTAINING SOLUTION WHICH COMPRISES ADJUSTING THE PH OF SAID IMPURE SOLUTION TO BETWEEN ABOUT 1.5 AND 2.5, THEN CONTACTING SAID IMPURE SOLUTION WITH A CARBOXYLIC CATIONIC EXCHANGE RESIN IN THE HYDROGEN CYCLE TO CAUSE ADSORPTION OF VITAMIN B12 THEREON, REMOVING IMPURITIES THEREFROM BY SUCESSIVELY WASHING THE VITAMIN B12-CONTAINING RESIN WITH ACID WATER HAVNG A PH OF BETWEEN ABOUT 1.0 AND 2.5, THEN WITH ACETONE CONTAINING AT LEAST 85% ACETONE WITH THE BALANCE WATER, AND REMOVING SAID VITAMIN B12 FROM SAID RESIN BY PASSING OVER SAID RESIN AN ACIDIFIED AQUEOUS ACETONE MIXTURE HAVING A PH OF ABOUT 1.0 TO 2.5, SAID MIXTURE COMPRISING FROM ABOUT 50% TO 75% ACETONE BY VOLUME AND ABOUT 25% TO 50% WATER BY VOLUME.
Claim 2
Dependent Claim
129 words
A PROCESS OF PURIFYING VITAMIN B12 IN AN IMPURE AQUEOUS VITAMIN B12-CONTAINING SOLUTION WHICH COMPRISES ADJUSTING THE PH OF SAID IMPURE SOLUTION TO BETWEEN ABOUT 1.5 AND 2.5, THEN CONTACTING SAID IMPURE SOLUTION WITH A CARBOXYLIC CATIONIC EXCHANGE RESIN IN THE HYDROGEN CYCLE TO CAUSE ADSORPTION OF VITAMIN B12 THEREON, REMOVING IMPURITIES THEREFROM BY SUCESSIVELY WASHING THE VITAMIN B12-CONTAINING RESIN WITH ACID WATER HAVNG A PH OF BETWEEN ABOUT 1.0 AND 2.5, THEN WITH ACETONE CONTAINING AT LEAST 85% ACETONE WITH THE BALANCE WATER, AND REMOVING SAID VITAMIN B12 FROM SAID RESIN BY PASSING OVER SAID RESIN AN ACIDIFIED AQUEOUS ACETONE MIXTURE HAVING A PH OF ABOUT 1.0 TO 2.5, SAID MIXTURE COMPRISING FROM ABOUT 50% TO 75% ACETONE BY VOLUME AND ABOUT 25% TO 50% WATER BY VOLUME.
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) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |