US2708628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized vitamin a compositions
Assignee: F Hoffmann La Roche AG
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Filing: 1953-11-17
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Granted: 1955-05-17
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Expires: 1973-11-17
Abstract
No abstract record available.
Inventors
- 👤 Bauernfeind Jacob Christopher
- 👤 Magid Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:58
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/59
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A COMPOSITION COMPRISING A SYNTHETIC FATTY ACID ESTER OF VITAMIN A INTIMATELY MIXED WITH N,N''-DIPHENYLP-PHENYLENE DIAMINE AS A STABILIZER FOR SAID ESTER.
Claim 2
Dependent Claim
22 words
A COMPOSITION COMPRISING A SYNTHETIC FATTY ACID ESTER OF VITAMIN A INTIMATELY MIXED WITH N,N''-DIPHENYLP-PHENYLENE DIAMINE AS A STABILIZER FOR SAID ESTER.
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) | 1958-05-16 | 1958-11-15 | 1959-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-16 | 1962-11-15 | 1963-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-16 | 1966-11-15 | 1967-05-17 | $7700.00 | Window Closed / Lapsed |