Patents by Inventor Pierre F. Chabardes

Pierre F. Chabardes 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).

  • Dihydropyran derivatives, processes for preparation and use
    Patent number: 5250710
    Abstract: The present invention relates to dihydropyran derivatives, processes for preparing, and processes of using the derivatives. The derivatives are prepared by condensation of lithium dienolate of prenal with an aldehyde or a ketone.The pyran derivative prepared from .beta.-ionylideneacetaldehyde when treated in the presence of a catalyst directly forms retinal.
    Type: Grant
    Filed: May 7, 1992
    Date of Patent: October 5, 1993
    Assignee: Rhone-Poulenc Nutrition Animale
    Inventors: Pierre F. Chabardes, Lucette Duhamel, Pierre Duhamel, Jerome Guillemont, Jean-Marie Poirier
  • Dihydropyran derivatives, processes for preparation and use
    Patent number: 5157133
    Abstract: The present invention relates to dihydropyran derivatives, processes for preparing, and processes of using the derivatives. The derivatives are prepared by condensation of lithium dienolate of prenal with an aldehyde or a ketone.The pyran derivative prepared from .beta.-ionylideneacetaldehyde when treated in the presence of a catalyst directly forms retinal.
    Type: Grant
    Filed: December 3, 1990
    Date of Patent: October 20, 1992
    Assignee: Rhone-Poulenc Nutrition Animale
    Inventors: Pierre F. Chabardes, Lucette Duhamel, Pierre Duhamel, Jerome Guillemont, Jean-Marie Poirier