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Patent US2613171A successfully refreshed from Google Patents.
US2613171A
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Two-phase three-solvent concentration of antipernicious anemia factors
Assignee: Pharmacia and Upjohn Co
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Filing: 1950-02-25
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Granted: 1952-10-07
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Expires: 1970-02-25
Abstract
No abstract record available.
Inventors
- 👤 William G Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:15
CPC Classifications
A; A61; A61K; A61K31/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR PURIFYING ANTI-PERNICIOUS ANEMIA FACTORS WHEREBY A MATERIAL CONTAINING NOT MORE THAN 5.0 MICROGRAMS OF VITAMIN B12 ACTIVITY PER MILLIGRAM OF SOLIDS MAY BE PURIFIED TO A PRODUCT HAVING A PURITY IN EXCESS OF APPROXIMATELY 120 MICROGRAMS OF VITAMIN B12 ACTIVITY PER MILLIGRAM OF SOLIDS, WHICH COMPRISES, INTIMETELY DISTRIBUTING A MATERIAL CONTAINING ANTIPERNICIOUS ANEMIA FACTORS THROUGHOUT A 2-PHASE TERNARY SOLVENT SYSTEM CONSISTING OF WATER, PHENOL, AND DIBUTYL ETHER, SAID SYSTEM HAVING A CON-
Claim 2
Dependent Claim
75 words
A PROCESS FOR PURIFYING ANTI-PERNICIOUS ANEMIA FACTORS WHEREBY A MATERIAL CONTAINING NOT MORE THAN 5.0 MICROGRAMS OF VITAMIN B12 ACTIVITY PER MILLIGRAM OF SOLIDS MAY BE PURIFIED TO A PRODUCT HAVING A PURITY IN EXCESS OF APPROXIMATELY 120 MICROGRAMS OF VITAMIN B12 ACTIVITY PER MILLIGRAM OF SOLIDS, WHICH COMPRISES, INTIMETELY DISTRIBUTING A MATERIAL CONTAINING ANTIPERNICIOUS ANEMIA FACTORS THROUGHOUT A 2-PHASE TERNARY SOLVENT SYSTEM CONSISTING OF WATER, PHENOL, AND DIBUTYL ETHER, SAID SYSTEM HAVING A CON-
References Cited (Backward Citations)
US2134256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-07 | 1956-04-07 | 1956-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-07 | 1960-04-07 | 1960-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-07 | 1964-04-07 | 1964-10-07 | $7700.00 | Window Closed / Lapsed |