Patents by Inventor Jean-Erick Ancel

Jean-Erick Ancel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for preparing vitamin A
    Patent number: 6384270
    Abstract: The invention relates to a process for making vitamin A from ethynyl-retro-&agr;-ionol using an allene acetate as intermediate.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: May 7, 2002
    Assignee: Aventis Animal Nutrition, S.A.
    Inventors: Jean-Erick Ancel, Pierre Meilland
  • Processes for preparing pesticidal intermediates
    Patent number: 6258973
    Abstract: The invention relates to a process for the preparation of compounds having the formula (I) wherein W, R2, R3, R5 and R6 are as defined in the description, which are useful as intermediates in the synthesis of pesticidally active compounds.
    Type: Grant
    Filed: May 17, 2000
    Date of Patent: July 10, 2001
    Assignee: Rhone-Poulenc Agro
    Inventors: Themistocles D. J. D'Silva, Jean-Erick Ancel
  • Processes for preparing pesticidal intermediates
    Patent number: 6084105
    Abstract: The invention relates to a process for the preparation of compounds having the formula (I) ##STR1## wherein W, R.sub.2, R.sub.3, R.sub.5 and R.sub.6 are as defined in the description, which are useful as intermediates in the synthesis of pesticidally active compounds.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: July 4, 2000
    Assignee: Rhone-Poulenc Agro
    Inventors: Themistocles D. J. D'Silva, Jean-Erick Ancel
  • Process for the preparation of substituted phenols
    Patent number: 5744617
    Abstract: A process for the preparation of substituted phenols, in particular, the condensation of phenols having one or more alkyl substituents with a butadiene derivative comprising at least six carbon atoms, in particular myrcene and/or .beta.-springene is disclosed. The cyclization, in the form of chromans, of the products obtained during this condensation and their hydrogenation in order to prepare vitamin E is also disclosed.
    Type: Grant
    Filed: May 10, 1996
    Date of Patent: April 28, 1998
    Assignee: Rhone-Poulenc Nutrition Animale
    Inventors: Jean-Erick Ancel, Hugues Bienayme, Pierre Meilland
  • Process for the preparation of vitamin A and new intermediates
    Patent number: 5637779
    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.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: June 10, 1997
    Assignee: Rhone-Poulenc Nutrition Animale
    Inventors: Jean-Erick Ancel, Hugues Bienayme
  • Intermediates for preparing vitamins A and E and carotenoids
    Patent number: 5449844
    Abstract: The present invention relates to a new method of condensing polyenic compounds wherein a compound having the formula III ##STR1## is condensed with a compound having the formula IV ##STR2## under the influence of a Lewis acid or a protic acid. R.sub.1 through R.sub.7 represent alkyl or alkenyl groups, A' is preferably chlorine, B is preferably a hydroxyl group, and n' is 0 to 10. The invention also relates to novel intermediates for use in the preparation of Vitamins A and E produced by means of the new method.
    Type: Grant
    Filed: November 27, 1992
    Date of Patent: September 12, 1995
    Assignee: Rhone-Poulenc Nutrition Animale
    Inventors: Jean-Erick Ancel, Bienayme, Hugues, Lucette Duhamel, Pierre Duhamel