US2631964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of vitamin b12
Assignee: Pfizer Inc
•
Filing: 1950-12-09
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Granted: 1953-03-17
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Expires: 1970-12-09
Abstract
No abstract record available.
Inventors
- 👤 Karl J Brunings
- 👤 Robert J Feeney
- 👤 Iii Isaiah A Solomons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:46
CPC Classifications
C; C12; C12P; C12P19/00; C12P19/26; C12P19/28; C12P19/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS WHICH COMPRISES EXTRACTING VITAMIN B12-ACTIVE MATERIALS FROM AN AQUEOUS SOLUTION HAVING PH OF AT LEAST 7 AND CONTAINING VITAMIN B12-ACTIVE MATERIALS DERIVED FROM MICROORGANISM FERMENTATION BROTHS, A NEUTRAL INORGANIC SALT AND AN EXCESS OF A CYANIDE SALT BEYOND THAT REQUIRED TO CONVERT SAID VITAMIN B12-ACTIVE MATERIALS TO VITAMIN B12 ITSELF, WHEREBY A VITAMIN B12-CYANIDE COMPLEX IS FORMED, INTO AN ORGANIC PHASE COMPRISING AN HYDROXYLATED ORGANIC EXTRACTING SOLVENT OF LIMITED SOLUBILITY IN THE AQUEOUS SOLUTION, TREATING THE VITAMINACEOUS MATERIALS THUS EXTRACTED TO REMOVE THE EXCESS CYANIDE ASSOCIATED THEREWITH, AND RECOVERING THE VITAMIN B12 SO PRODUCED.
Claim 2
Dependent Claim
96 words
A PROCESS WHICH COMPRISES EXTRACTING VITAMIN B12-ACTIVE MATERIALS FROM AN AQUEOUS SOLUTION HAVING PH OF AT LEAST 7 AND CONTAINING VITAMIN B12-ACTIVE MATERIALS DERIVED FROM MICROORGANISM FERMENTATION BROTHS, A NEUTRAL INORGANIC SALT AND AN EXCESS OF A CYANIDE SALT BEYOND THAT REQUIRED TO CONVERT SAID VITAMIN B12-ACTIVE MATERIALS TO VITAMIN B12 ITSELF, WHEREBY A VITAMIN B12-CYANIDE COMPLEX IS FORMED, INTO AN ORGANIC PHASE COMPRISING AN HYDROXYLATED ORGANIC EXTRACTING SOLVENT OF LIMITED SOLUBILITY IN THE AQUEOUS SOLUTION, TREATING THE VITAMINACEOUS MATERIALS THUS EXTRACTED TO REMOVE THE EXCESS CYANIDE ASSOCIATED THEREWITH, AND RECOVERING THE VITAMIN B12 SO PRODUCED.
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) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |