US2739167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized, oil-soluble vitamins and process of preparing the same
Assignee: Merck and Co Inc
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Filing: 1953-01-22
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Granted: 1956-03-20
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Expires: 1973-01-22
Abstract
No abstract record available.
Inventors
- 👤 John B Conn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:15
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/59
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
36 words
A DRY STABILIZED VITAMIN PREPARATION COMPRISING CRYSTALLINE PARTICLES OF AN OIL-SOLUBLE UNSTABLE VITAMIN AND A STABILIZING COATING ON EACH PARTICLES COMPRISING SYNTHETIC PROTEIN-LIKE MATERIAL PRODUCED BY A CHYMOTRYPSIN CATALYZED REACTION OF A PEPTIC DIGEST OF PROTEIN.
Claim 2
Dependent Claim
36 words
A DRY STABILIZED VITAMIN PREPARATION COMPRISING CRYSTALLINE PARTICLES OF AN OIL-SOLUBLE UNSTABLE VITAMIN AND A STABILIZING COATING ON EACH PARTICLES COMPRISING SYNTHETIC PROTEIN-LIKE MATERIAL PRODUCED BY A CHYMOTRYPSIN CATALYZED REACTION OF A PEPTIC DIGEST OF PROTEIN.
Claim 3
Dependent Claim
69 words
A PROCESS FOR THE PRODUCTION OF STABILIZED CRYSTALLINE VITAMIN A WHICH COMPRISES PREPARING AN AQUEOUS SOLUTION OF A PEPTIC DIGEST OF PROTEIN, MIXING CRYSTALLINE PARTICLES OF VITAMIN A WITH THE SOLUTION, PRODUCING A REACTION IN SAID DIGEST BY ADDING CHYMOTRYPSIN AND THEREBY PRODUCING A SYNTHETIC PROTEIN-LIKE MATERIAL IN THE FORM OF A GEL COATING THE PARTICLES, AND DRYING THE RESULTANT MIXTURE, THEREBY PRODUCING DRY STABILIZED COATED CRYSTALLINE VITAMIN A.
Claim 4
Dependent Claim
69 words
A PROCESS FOR THE PRODUCTION OF STABILIZED CRYSTALLINE VITAMIN A WHICH COMPRISES PREPARING AN AQUEOUS SOLUTION OF A PEPTIC DIGEST OF PROTEIN, MIXING CRYSTALLINE PARTICLES OF VITAMIN A WITH THE SOLUTION, PRODUCING A REACTION IN SAID DIGEST BY ADDING CHYMOTRYPSIN AND THEREBY PRODUCING A SYNTHETIC PROTEIN-LIKE MATERIAL IN THE FORM OF A GEL COATING THE PARTICLES, AND DRYING THE RESULTANT MIXTURE, THEREBY PRODUCING DRY STABILIZED COATED CRYSTALLINE VITAMIN A.
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) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |