Patent US2643968A successfully refreshed from Google Patents.
US2643968A
Expired / Lapsed
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Recovery of vitamin b12 with monohalophenols
Assignee: Wyeth Holdings LLC
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Filing: 1951-02-16
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Granted: 1953-06-30
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Expires: 1971-02-16
Abstract
No abstract record available.
Inventors
- 👤 Mccormick Jerry Robert Daniel
- 👤 Muller Siegfried Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:26
CPC Classifications
A; A61; A61K; A61K31/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
THE METHOD WHICH COMPRISES THE STEP OF BRINGING INTO INTERFACIAL CONTACT AN AQUEOUS SOLUTION CONTAINING VITAMIN B12 AND A WATER INSOLUBLE MONO-HALOPHENOL HAVING A MELTING POINT BELOW 100* C., SEPARATING THE PHENOLIC PHASE CONTAINING THE VITAMIN FROM THE AQUEOUS PHASE AND THEREAFTER RECOVERING VITAMIN B12 FROM THE SAID MONO-HALOPHENOL PHASE.
Claim 2
Independent Claim
50 words
THE METHOD WHICH COMPRISES THE STEP OF BRINGING INTO INTERFACIAL CONTACT AN AQUEOUS SOLUTION CONTAINING VITAMIN B12 AND A WATER INSOLUBLE MONO-HALOPHENOL HAVING A MELTING POINT BELOW 100* C., SEPARATING THE PHENOLIC PHASE CONTAINING THE VITAMIN FROM THE AQUEOUS PHASE AND THEREAFTER RECOVERING VITAMIN B12 FROM THE SAID MONO-HALOPHENOL PHASE.
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) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |