US2686751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitamin a stabilization
Assignee: Eastman Kodak Co
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Filing: 1952-05-10
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Granted: 1954-08-17
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Expires: 1972-05-10
Abstract
No abstract record available.
Inventors
- 👤 Norris D Embree
- 👤 Henry M Kascher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:45
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/59
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A VITAMIN A COMPOSITION OF IMPROVED STABILITY AND COMPRISING VITAMIN A HAVING ADMIXED THEREWITH AT LEAST 1% BY WEIGHT OF MONOALKYL ESTER OF CITRIC ACID AND AT LEAST 1% BY WEIGHT OF PHENOLIC ANTIOXIDANT SELECTED FROM THE GROUP OF HYDROXYLATED AROMATIC COMPOUNDS CONSISTING OF TOCOPHEROLS, ALKYL GALLATES, BUTYLATED HYDROXY ANISOLE, AND HYDROQUINONE, BOTH BASED ON THE WEIGHT OF SAID VITAMIN A.
Claim 2
Dependent Claim
61 words
A VITAMIN A COMPOSITION OF IMPROVED STABILITY AND COMPRISING VITAMIN A HAVING ADMIXED THEREWITH AT LEAST 1% BY WEIGHT OF MONOALKYL ESTER OF CITRIC ACID AND AT LEAST 1% BY WEIGHT OF PHENOLIC ANTIOXIDANT SELECTED FROM THE GROUP OF HYDROXYLATED AROMATIC COMPOUNDS CONSISTING OF TOCOPHEROLS, ALKYL GALLATES, BUTYLATED HYDROXY ANISOLE, AND HYDROQUINONE, BOTH BASED ON THE WEIGHT OF SAID 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) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |