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US2621144A
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Vitamin b12 recovery process
Assignee: Merck and Co Inc
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Filing: 1950-09-08
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Granted: 1952-12-09
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Expires: 1970-09-08
Abstract
No abstract record available.
Inventors
- 👤 Arnold J Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:47
CPC Classifications
A; A61; A61K; A61K31/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
61 words
A PROCESS FOR RECOVERING VITAMIN B12 FROM AN AQUEOUS SOLUTION CONTAINING VITAMIN B12 AND ASSOCIATED IMPURITIES WHICH COMPRISES FORMING AN INSOLUBLE METAL CYANIDE SELECTED FROM THE GROUP CONSISTING OF COPPER, COBALT, NICKEL, ZINC, AND SILVER CYANIDES IN SAID VITAMIN B12 CONTAINING SOLUTION, THEREBY PRECIPITATING AN INSOLUBLE METAL CYANIDE-VITAMIN B12 COMPLEX, SEPARATING SAID INSOLUBLE COMPLEX, AND RECOVERING VITAMIN B12 FROM SAID COMPLEX.
References Cited (Backward Citations)
US2530416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |