Patent US2653900A successfully refreshed from Google Patents.
US2653900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitamin b12 purification process
Assignee: Merck and Co Inc
•
Filing: 1951-06-07
•
Granted: 1953-09-29
•
Expires: 1971-06-07
Abstract
No abstract record available.
Inventors
- 👤 Arnold J Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:16
CPC Classifications
A; A61; A61K; A61K31/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
THE PROCESS THAT COMPRISES CONTACTING AN AQUEOUS SOLUTION CONTAINING A VITAMIN B12 ACTIVE SUBSTANCE AND CONTAMINANTS, WHEREIN SAID VITAMIN B12 ACTIVE SUBSTANCE COMPRISES AT LEAST 0.01% OF THE TOTAL SOLIDS, WITH ZINC HYDROXIDE, AND SEPARATING THE ZINC HYDROXIDE CONTAINING A SUBSTANTIAL PORTION OF SAID CONTAMINANTS FROM A PURIFIED RESIDUAL SOLUTION CONTAINING SAID VITAMIN B12 ACTIVE SUBSTANCE.
References Cited (Backward Citations)
GB590956A
Cited
US2530416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-28 | 1957-03-30 | 1957-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-28 | 1961-03-30 | 1961-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-28 | 1965-03-30 | 1965-09-29 | $7700.00 | Window Closed / Lapsed |