Patent US2830933A successfully refreshed from Google Patents.
US2830933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitamin b12 products and preparation thereof
Assignee: Pfizer Inc
•
Filing: 1955-07-14
•
Granted: 1958-04-15
•
Expires: 1975-07-14
Abstract
No abstract record available.
Inventors
- 👤 Edward F Bouchard
- 👤 Ira J Friedman
- 👤 Roy J Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:15
CPC Classifications
A; A61; A61K; A61K31/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
31 words
A VITAMIN, B12 COMPOSITION CONTAINING VITAMIN COMPOSITION COMPONENTS NORMALLY DELETERIOUS TO VITAMIN B12 WHEREIN THE VITAMIN B12 IS PRESENT AS AN ADSORBATE ON A SYNETHETIC CATION EXCHANGE RESIN OF LOW TOXICITY.
Claim 2
Dependent Claim
31 words
A VITAMIN, B12 COMPOSITION CONTAINING VITAMIN COMPOSITION COMPONENTS NORMALLY DELETERIOUS TO VITAMIN B12 WHEREIN THE VITAMIN B12 IS PRESENT AS AN ADSORBATE ON A SYNETHETIC CATION EXCHANGE RESIN OF LOW TOXICITY.
Claim 3
Dependent Claim
47 words
A PROCESS WHICH COMPRISES CONTACTING A VITAMIN B12 CONTAINING AQUEOUS SOLUTION WITH A SYNTHETIC CATION EXCHANGE RESIN, REMOVING THE RESIN ADSORBATE FROM THE AQUEOUS SOLUTION, DRYING THE RESIN ADSORBATE AND BLENDING IT WITH VITAMIN COMPOSITION COMPONENTS AT LEAST ONE OF WHICH IS NORMALLY DELETERIOUS TO VITAMIN B12.
Claim 4
Dependent Claim
47 words
A PROCESS WHICH COMPRISES CONTACTING A VITAMIN B12 CONTAINING AQUEOUS SOLUTION WITH A SYNTHETIC CATION EXCHANGE RESIN, REMOVING THE RESIN ADSORBATE FROM THE AQUEOUS SOLUTION, DRYING THE RESIN ADSORBATE AND BLENDING IT WITH VITAMIN COMPOSITION COMPONENTS AT LEAST ONE OF WHICH IS NORMALLY DELETERIOUS TO VITAMIN B12.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |