Patent US2573897A successfully refreshed from Google Patents.
US2573897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of vitamin a from fish liver oil
Assignee: PPG Industries Inc
•
Filing: 1947-01-29
•
Granted: 1951-11-06
•
Expires: 1967-01-29
Abstract
No abstract record available.
Inventors
- 👤 Stephen E Freeman
- 👤 Stewart W Gloyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:10
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/59
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS OF OBTAINING A CONCENTRATE OF VITAMIN A FROM FISH LIVER OIL CONTAINING SAID VITAMIN WHICH PROCESS COMPRISING PASSING THE OIL UPWARDLY IN COUNTERCURRENT FLOW THROUGH A VERTICALLY ELONGATED ZONE OF DOWNWARDLY FLOWING ORGANIC POLAR SOLVENT WHICH IS PARTIALLY MISCIBLE THEREWITH, THE OIL-SOLVENT MIXTURE IN THE UPPER PORTION OF THE ZONE BEING MAINTAINED AT A SUBSTANTIALLY HIGHER TEMPERATURE THAN THE SOLVENT CONTAINING DISSOLVED OIL IN THE LOWER PORTION OF THE ZONE WHEREBY TO OBTAIN A COOL EXTRACT OF GLYCERIDE OIL AND SOLVENT WHICH IS HIGHLY ENRICHED IN VITAMIN A AND A WARM RAFFINATE WHICH IS CORRESPONDINGLY IMPOVERISHED IN VITAMIN A, DRAWING OFF THE RAFFINATE AT THE TOP OF THE ZONE AND THE SOLUTION OF SOLVENT AND EXTRACT AT THE BOTTOM OF THE ZONE AND EVAPORATING THE SOLVENT TO OBTAIN THE CONCENTRATE.
Claim 2
Dependent Claim
132 words
A PROCESS OF OBTAINING A CONCENTRATE OF VITAMIN A FROM FISH LIVER OIL CONTAINING SAID VITAMIN WHICH PROCESS COMPRISING PASSING THE OIL UPWARDLY IN COUNTERCURRENT FLOW THROUGH A VERTICALLY ELONGATED ZONE OF DOWNWARDLY FLOWING ORGANIC POLAR SOLVENT WHICH IS PARTIALLY MISCIBLE THEREWITH, THE OIL-SOLVENT MIXTURE IN THE UPPER PORTION OF THE ZONE BEING MAINTAINED AT A SUBSTANTIALLY HIGHER TEMPERATURE THAN THE SOLVENT CONTAINING DISSOLVED OIL IN THE LOWER PORTION OF THE ZONE WHEREBY TO OBTAIN A COOL EXTRACT OF GLYCERIDE OIL AND SOLVENT WHICH IS HIGHLY ENRICHED IN VITAMIN A AND A WARM RAFFINATE WHICH IS CORRESPONDINGLY IMPOVERISHED IN VITAMIN A, DRAWING OFF THE RAFFINATE AT THE TOP OF THE ZONE AND THE SOLUTION OF SOLVENT AND EXTRACT AT THE BOTTOM OF THE ZONE AND EVAPORATING THE SOLVENT TO OBTAIN THE CONCENTRATE.
References Cited (Backward Citations)
GB220697A
Cited
DE560146C
Cited
US2118454A
Cited
US2090738A
Cited
US2248619A
Cited
US2347460A
Cited
US2380418A
Cited
US2394968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-05 | 1955-05-07 | 1955-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-05 | 1959-05-07 | 1959-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-05 | 1963-05-07 | 1963-11-06 | $7700.00 | Window Closed / Lapsed |