US2920015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Long-acting vitamin b12
Assignee: Armour and Co
•
Filing: 1957-08-27
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Granted: 1960-01-05
•
Expires: 1977-08-27
Abstract
No abstract record available.
Inventors
- 👤 Robert E Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:17
CPC Classifications
C; C07; C07H; C07H23/00; A; A61; A61K; A61K31/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
AN INJECTIBLE VITAMIN B12 COMPOSITION, COMPRISING A WATER-INSOLUBLE COMPLEX HAVING A VITAMIN B12-ACTIVE SUBSTANCE COMPONENT, A ZINC COMPONENT AND A TANNIC ACID COMPONENT.
Claim 2
Dependent Claim
23 words
AN INJECTIBLE VITAMIN B12 COMPOSITION, COMPRISING A WATER-INSOLUBLE COMPLEX HAVING A VITAMIN B12-ACTIVE SUBSTANCE COMPONENT, A ZINC COMPONENT AND A TANNIC ACID COMPONENT.
Claim 3
Dependent Claim
80 words
IN A METHOD OF SELECTIVELY SEPARATING VITAMIN B12 FROM ASSOCIATED IMPURITIES, THE STEPS OF COMBINING IN AN AQUEOUS SOLUTION WITH A CRUDE VITAMIN B12 PREPARATION CONTAINING A VITAMIN B12-ACTIVE SUBSTANCE AND ASSOCIATED IMPURITIES A WATER-SOLUBLE ZINC SALT AND TANNIC ACID TO OBTAIN IN THE RESULTING AQUEOUS SUSPENSION A WATER-IN SOLUBLE COMPLEX HAVING A VITAMIN B12-ACTIVE SUBSTANCE COMPONENT, A ZINC COMPONENT AND A TANNIC ACID COMPONENT AND TO SELECTIVELY SOLUBLIZE SAID IMPURITIES, AND SEPARATING SAID WATER-INSOLUBLE COMPLEX FROM THE SUPERNATANT LIQUID.
Claim 4
Dependent Claim
80 words
IN A METHOD OF SELECTIVELY SEPARATING VITAMIN B12 FROM ASSOCIATED IMPURITIES, THE STEPS OF COMBINING IN AN AQUEOUS SOLUTION WITH A CRUDE VITAMIN B12 PREPARATION CONTAINING A VITAMIN B12-ACTIVE SUBSTANCE AND ASSOCIATED IMPURITIES A WATER-SOLUBLE ZINC SALT AND TANNIC ACID TO OBTAIN IN THE RESULTING AQUEOUS SUSPENSION A WATER-IN SOLUBLE COMPLEX HAVING A VITAMIN B12-ACTIVE SUBSTANCE COMPONENT, A ZINC COMPONENT AND A TANNIC ACID COMPONENT AND TO SELECTIVELY SOLUBLIZE SAID IMPURITIES, AND SEPARATING SAID WATER-INSOLUBLE COMPLEX FROM THE SUPERNATANT LIQUID.
References Cited (Backward Citations)
US2621144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |