Patent US2552908A successfully refreshed from Google Patents.
US2552908A
Expired / Lapsed
US
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Process for concentration of neovitamin a
Assignee: Eastman Kodak Co
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Filing: 1947-12-12
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Granted: 1951-05-15
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Expires: 1967-12-12
Abstract
No abstract record available.
Inventors
- 👤 Charles D Robeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:57
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/59
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
THE PROCESS OF PREPARING A CONCENTRATE OF NEO-VITAMIN A HAVING GREATER STABILITY TO OXIDATION THAN VITAMIN A AND HAVING SUBSTANTIAL VITAMIN A ACTIVIATY, WHICH PROCESS COMPRISES SAPONIFYING A FISH OIL, SEPARATING THE SAPONIFIED PORTION OF SAID OIL FROM THE UNSAPONIFIED PORTION THEREOF, SEPARATING VITAMIN A ALCOHOL FORM SAID UNSAPONIFIED PORTION AND THEREBY LEAVING A RESIDUAL PORTION CONTAINING NEOVITAMIN A, AND THEREAFTER SEPARATING AND CONCENTRATING SAID NEOVITAMIN A FROM SAID RESIDUAL PORTION BY SUBJECTING SAID RESIDUAL PORTION TO CHROMATOGRAPHIC ADSORPTION EFFECTIVE TO ADSORB SAID NEOVITAMIN A, AND SEPARATELY ELUTING SAID NEOVITAMIN A AND THEREBY OBTAINING A CONCENTRATE OF NEOVITAMIN A CONTAINING A SUBSTANTIALLY HIGHER PERCENTAGE OF NEOVITAMIN A THAN SAID FISH OIL AND BEING SUBSTANTIALLY FREE OF VITAMIN A.
Claim 2
Dependent Claim
118 words
THE PROCESS OF PREPARING A CONCENTRATE OF NEO-VITAMIN A HAVING GREATER STABILITY TO OXIDATION THAN VITAMIN A AND HAVING SUBSTANTIAL VITAMIN A ACTIVIATY, WHICH PROCESS COMPRISES SAPONIFYING A FISH OIL, SEPARATING THE SAPONIFIED PORTION OF SAID OIL FROM THE UNSAPONIFIED PORTION THEREOF, SEPARATING VITAMIN A ALCOHOL FORM SAID UNSAPONIFIED PORTION AND THEREBY LEAVING A RESIDUAL PORTION CONTAINING NEOVITAMIN A, AND THEREAFTER SEPARATING AND CONCENTRATING SAID NEOVITAMIN A FROM SAID RESIDUAL PORTION BY SUBJECTING SAID RESIDUAL PORTION TO CHROMATOGRAPHIC ADSORPTION EFFECTIVE TO ADSORB SAID NEOVITAMIN A, AND SEPARATELY ELUTING SAID NEOVITAMIN A AND THEREBY OBTAINING A CONCENTRATE OF NEOVITAMIN A CONTAINING A SUBSTANTIALLY HIGHER PERCENTAGE OF NEOVITAMIN A THAN SAID FISH OIL AND BEING SUBSTANTIALLY FREE OF VITAMIN A.
References Cited (Backward Citations)
US2111049A
Cited
US2173629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |