US2907696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable vitamin a for aqueous dispersions
Assignee: Pfizer Inc
•
Filing: 1956-01-03
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Granted: 1959-10-06
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Expires: 1976-01-03
Abstract
No abstract record available.
Inventors
- 👤 William E Stieg
- 👤 Joseph A Kardys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:39
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A PROCESS FOR PREPARATION OF STABLE AQUEOUS SUSPENSIONS OF VITAMIN A WHICH COMPRISES MIXING AN ALIPHATIC ESTER OF SYNTHETIC VITAMIN A1 WITH AN ALIPHATIC ESTER OF NEOVITAMIN A1 AND SUSPENDING THE RESULTING MIXTURE IN AN AQUEOUS MEDIUM.
Claim 2
Dependent Claim
37 words
A PROCESS FOR PREPARATION OF STABLE AQUEOUS SUSPENSIONS OF VITAMIN A WHICH COMPRISES MIXING AN ALIPHATIC ESTER OF SYNTHETIC VITAMIN A1 WITH AN ALIPHATIC ESTER OF NEOVITAMIN A1 AND SUSPENDING THE RESULTING MIXTURE IN AN AQUEOUS MEDIUM.
References Cited (Backward Citations)
US2552908A
Cited
US2693435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |