The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 1997
Filed:
Feb. 03, 1995
Applicant:
Inventors:
Jean-Erick Ancel, Lyons, FR;
Hugues Bienayme, Lyons, FR;
Assignee:
Rhone-Poulenc Nutrition Animale, Antony, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568824 ; 568447 ;
Abstract
A process for the preparation of vitamin A which comprises condensing ethynyl-.beta.-ionol with the acetal of a C.sub.5 allylic halide in the presence of a catalytic amount of a copper-based catalyst and a base; hydrogenating the condensed compound; eliminating the hydroxyl functional group to obtain retinal; and correcting the retinal obtained.
Ancel, Jean-Erick. (1997). Process for the preparation of vitamin a and new intermediates (U.S. Patent No. 5637779). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5637779
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