Patent US2984661A successfully refreshed from Google Patents.
US2984661A
Expired / Lapsed
US
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Method of preparing pure vitamin b12 and intermediary obtained thereby
Assignee: Sanofi Aventis France
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Filing: 1956-08-08
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Granted: 1961-05-16
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Expires: 1976-08-08
Abstract
No abstract record available.
Inventors
- 👤 Nomine Gerard
- 👤 Penasse Lucien
- 👤 Barthelemy Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:27
CPC Classifications
C; C07; C07H; C07H23/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
THE METHOD OF RECOVERING PURE VITAMIN B12 FROM AN AQUEOUS SOLUTION COMPRISING AT LEAST 0.5% OF VITAMIN B12, WHICH COMPRISES THE STEPS OF ADDING TO A QUANTITY OF SAID SOLUTION ABOUT 2 TO 3% BY VOLUME OF PHENOL, PRECIPITATING THE HYDRATED, CRYSTALLINE VITAMIN B12-PHENOL, COMPLEX, SEPARATING SAID COMPLEX, REDISSOLVING SAID COMPLEX IN WATER, ADDING A WATER-MISCIBLE NON-SOLVENT FOR VITAMIN B12 AND SEPARATING THE RESULTING PRECIPITATE.
Claim 2
Independent Claim
65 words
THE METHOD OF RECOVERING PURE VITAMIN B12 FROM AN AQUEOUS SOLUTION COMPRISING AT LEAST 0.5% OF VITAMIN B12, WHICH COMPRISES THE STEPS OF ADDING TO A QUANTITY OF SAID SOLUTION ABOUT 2 TO 3% BY VOLUME OF PHENOL, PRECIPITATING THE HYDRATED, CRYSTALLINE VITAMIN B12-PHENOL, COMPLEX, SEPARATING SAID COMPLEX, REDISSOLVING SAID COMPLEX IN WATER, ADDING A WATER-MISCIBLE NON-SOLVENT FOR VITAMIN B12 AND SEPARATING THE RESULTING PRECIPITATE.
Claim 3
Dependent Claim
9 words
HYDRATED, CRYSTALLINE VITAMIN B12-PHENOL COMPLEXES OF THE GENERAL FORMULA
Claim 4
Dependent Claim
9 words
HYDRATED, CRYSTALLINE VITAMIN B12-PHENOL COMPLEXES OF THE GENERAL FORMULA
References Cited (Backward Citations)
US2823165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |