US3143564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing 2-transvitamin a acid
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1962-01-15
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Granted: 1964-08-04
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Expires: 1982-01-15
Abstract
No abstract record available.
Inventors
- 👤 Matsui Masanao
- 👤 Saijo Shigeya
- 👤 Ohizumi Kiyoshi
- 👤 Nishida Teruya
- 👤 Okano Shigeru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:20
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/16; C; C07; C07C; C07C403/00; C07C403/20; C07B; C07B2200/00; C07B2200/09; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A METHOD FOR PRODUCING 2-TRANS-VITAMIN A ACID COMPOUNDS, COMPRISING CONTACTING ONE MEMBER OF THE GROUP CONSISTING OF 2-CIS-VITAMIN A ACID, ITS LOWER ALKYL ESTERS AND UNSUBSTITUTED AMIDES, WITH POTASSIUM AMIDE IN AN AMOUNT OF AT LEAST 1 MOL PER MOL OF THE 2-VIS-VITAMIN A ACID COMPOUND TO BE ISOMERIZED IN AN INERT MEDIUM FOR 0.5 TO 20 HOURS, THEREBY TO BE ISOMERIZED TO YIELD THE CORRESPONDING 2-TRANS-VITAMIN A ACID COMPOUND.
Claim 2
Independent Claim
70 words
A METHOD FOR PRODUCING 2-TRANS-VITAMIN A ACID COMPOUNDS, COMPRISING CONTACTING ONE MEMBER OF THE GROUP CONSISTING OF 2-CIS-VITAMIN A ACID, ITS LOWER ALKYL ESTERS AND UNSUBSTITUTED AMIDES, WITH POTASSIUM AMIDE IN AN AMOUNT OF AT LEAST 1 MOL PER MOL OF THE 2-VIS-VITAMIN A ACID COMPOUND TO BE ISOMERIZED IN AN INERT MEDIUM FOR 0.5 TO 20 HOURS, THEREBY TO BE ISOMERIZED TO YIELD THE CORRESPONDING 2-TRANS-VITAMIN A ACID COMPOUND.
References Cited (Backward Citations)
US2576104A
Cited
US2680755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |