US3344151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating tocopherol epimers
Assignee: Eastman Kodak Co
•
Filing: 1965-07-02
•
Granted: 1967-09-26
•
Expires: 1985-07-02
Abstract
No abstract record available.
Inventors
- 👤 Donald R Nelan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:20
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58; C07D311/70; C07D311/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A PROCESS FOR OBTAINING FROM EPIMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF (1) MIXTURES OF 2D-A-TOCOPHEROL AND 21-A-TOCOPHEROL, (2) EPIMERIC MIXTURES OF A CRYSTALLIZABLE ESTER OF 2D-A-TOCOPHEROL AND AN OPTICALLY INACTIVE ACID, AND A CRYSTALLIZABLE ESTER OF 21-ATOCOPHEROL AND SAID ACID, SAID ACID BEING SELECTED FROM THE GROUP CONSISTING OF SATURATED ALIPHATIC CARBOXYLIC ACIDS HAVING 1-24 CARBON ATOMS, BENZOIC ACID, P-PHENYLAZOBENZOIC ACID AND SUCCINIC ACID, AND (3) EPIMERIC MIXTURES OF A CRYSTALLIZABLE SALT OF A BASE AND THE ACID SUCCINATE ESTER OF 2D-A-TOCOPHEROL, AND A CRYSTALLIZABLE SALT OF SAID BASE AND THE ACID SUCCINATE ESTER OF 21-A-TOCOPHEROL, A PRODUCT WHEREIN ONE EPIMER IS AT A WEIGHT RATION RELATIVE TO THE OUTER EPIMER SUBSTANTIALLY GREATER THAN THE WEIGHT RATIO OF SAID ONE EPIMER TO SAID OTHER EPIMER IN SAID EPIMERIC MATERIAL, WHICH COMPRISES: (1) DISSOLVING SAID EPIMERIC MATERIAL IN A CRYSTALLIZATION SOLVENT THEREFOR, WHEREBY A SOLUTION IS FORMED; (2) CHANGING THE TEMPERATURE OF SAID SOLUTION TO A TEMPERATURE AT WHICH A SUBSTANTIAL QUANTITY OF SAID EPIMERIC MATERIAL IS INSOLUBLE IN SAID SOLVENT, WHEREBY CRYSTALLINE SOLIDS ARE PRECIPITATED FROM SAID SOLUTION; AND (3) SEPARATING SAID SOLIDS FROM THE RESULTING MOTHER LIQUOR, WHEREBY SAID PRODUCT IS OBTAINED.
Claim 2
Dependent Claim
195 words
A PROCESS FOR OBTAINING FROM EPIMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF (1) MIXTURES OF 2D-A-TOCOPHEROL AND 21-A-TOCOPHEROL, (2) EPIMERIC MIXTURES OF A CRYSTALLIZABLE ESTER OF 2D-A-TOCOPHEROL AND AN OPTICALLY INACTIVE ACID, AND A CRYSTALLIZABLE ESTER OF 21-ATOCOPHEROL AND SAID ACID, SAID ACID BEING SELECTED FROM THE GROUP CONSISTING OF SATURATED ALIPHATIC CARBOXYLIC ACIDS HAVING 1-24 CARBON ATOMS, BENZOIC ACID, P-PHENYLAZOBENZOIC ACID AND SUCCINIC ACID, AND (3) EPIMERIC MIXTURES OF A CRYSTALLIZABLE SALT OF A BASE AND THE ACID SUCCINATE ESTER OF 2D-A-TOCOPHEROL, AND A CRYSTALLIZABLE SALT OF SAID BASE AND THE ACID SUCCINATE ESTER OF 21-A-TOCOPHEROL, A PRODUCT WHEREIN ONE EPIMER IS AT A WEIGHT RATION RELATIVE TO THE OUTER EPIMER SUBSTANTIALLY GREATER THAN THE WEIGHT RATIO OF SAID ONE EPIMER TO SAID OTHER EPIMER IN SAID EPIMERIC MATERIAL, WHICH COMPRISES: (1) DISSOLVING SAID EPIMERIC MATERIAL IN A CRYSTALLIZATION SOLVENT THEREFOR, WHEREBY A SOLUTION IS FORMED; (2) CHANGING THE TEMPERATURE OF SAID SOLUTION TO A TEMPERATURE AT WHICH A SUBSTANTIAL QUANTITY OF SAID EPIMERIC MATERIAL IS INSOLUBLE IN SAID SOLVENT, WHEREBY CRYSTALLINE SOLIDS ARE PRECIPITATED FROM SAID SOLUTION; AND (3) SEPARATING SAID SOLIDS FROM THE RESULTING MOTHER LIQUOR, WHEREBY SAID PRODUCT IS OBTAINED.
References Cited (Backward Citations)
US2215398A
Cited
US3153053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |