US2694679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparing vitamin b12 analogs
Assignee: Merck and Co Inc
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Filing: 1951-03-27
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Granted: 1954-11-16
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Expires: 1971-03-27
Abstract
No abstract record available.
Inventors
- 👤 Arnold J Holland
- 👤 George E Boxer
- 👤 James C Rickards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:58
CPC Classifications
A; A61; A61K; A61K31/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE PROCESS THAT COMPRISES ADDING TO AN AQUEOUS SOLUTION CONTAINING VITAMIN B12 A QUANTITY OF ACID IN MOLAR EXCESS OF THE AMOUNT OF VITAMIN B12 PRESENT, AND SUBJECTING THE ACIDIFIED SOLUTION TO IRRADIATION BY LIGHT WITHIN THE ULTRA-VIOLET AND VISIBLE RANGE WHILE PASSING AN INERT GAS THROUGH THE SOLUTION TO REMOVE THE HYDROGEN CYANIDE THUS FORMED, AND CONTINUING THE IRRADIATION UNTIL NO FURTHER HYDROGEN CYANIDE IS EVOLVED, THEREBY EFFECTING A SUBSTANTIALLY QUANTITATIVE CONVERSION OF THE VITAMIN B12 TO AN ANALOG CONTAINING, IN PLACE OF THE CN GROUP, THE ANION PRESENT IN SAID ACID.
Claim 2
Dependent Claim
93 words
THE PROCESS THAT COMPRISES ADDING TO AN AQUEOUS SOLUTION CONTAINING VITAMIN B12 A QUANTITY OF ACID IN MOLAR EXCESS OF THE AMOUNT OF VITAMIN B12 PRESENT, AND SUBJECTING THE ACIDIFIED SOLUTION TO IRRADIATION BY LIGHT WITHIN THE ULTRA-VIOLET AND VISIBLE RANGE WHILE PASSING AN INERT GAS THROUGH THE SOLUTION TO REMOVE THE HYDROGEN CYANIDE THUS FORMED, AND CONTINUING THE IRRADIATION UNTIL NO FURTHER HYDROGEN CYANIDE IS EVOLVED, THEREBY EFFECTING A SUBSTANTIALLY QUANTITATIVE CONVERSION OF THE VITAMIN B12 TO AN ANALOG CONTAINING, IN PLACE OF THE CN GROUP, THE ANION PRESENT IN SAID ACID.
References Cited (Backward Citations)
US2566123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |