Patent US2628186A successfully refreshed from Google Patents.
US2628186A
Expired / Lapsed
US
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Carboxylic ion exchange resin purification of vitamin b12
Assignee: Research Corp
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Filing: 1950-01-04
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Granted: 1953-02-10
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Expires: 1970-01-04
Abstract
No abstract record available.
Inventors
- 👤 Shive William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:20
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/014
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
66 words
THE PROCESS OF PURIFYING VITAMIN B12 WHICH COMPRISES CONTACTING AN IMPURE AQUEOUS SOLUTION OF VITAMIN B12 AT A PH BETWEEN ABOUT PH 3 AND ABOUT PH 6 WITH A CARBOXYLIC ION-EXCHANGE RESIN ADJUSTED TO A PH BETWEEN ABOUT PH 3 AND ABOUT PH 6 AND ELUTING THE VITAMIN B12 FROM SAID RESIN CONTACTING SAID RESIN WITH A NONNEUTRAL AQUEOUS SOLUTION OF A WATER-MISCIBLE, POLAR ORGANIC SOLVENT.
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) | 1956-02-10 | 1956-08-11 | 1957-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-10 | 1960-08-11 | 1961-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-10 | 1964-08-11 | 1965-02-10 | $7700.00 | Window Closed / Lapsed |