Patents by Inventor Mario Mazzuchelli

Mario Mazzuchelli 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).

  • Process for producing cycloalkenylalkenes
    Patent number: 5155255
    Abstract: A process for the manufacture of certain cycloalkenylalkenes, e.g. vitamin A acetate, comprises dehydrating 1-(5-acetoxy-3-methyl-penta-1,3-dienyl)-2,6,6-trimethyl-cyclo hexanol or 4 aetoxy-1-(5-acetoxy-3-methyl-penta-1,3-dienyl)-2,6,6-trimethyl-cyclohexano l or 1-(9-acetoxy-3,7-dimethyl-4-hydroxy-nona-2,5,7-trienyl)-2,6,6-trimethyl- cyclohexene in the presence of an alkali metal bromide or of manganese bromide or of a hydrate of such a bromide as the catalyst and in an organic solvent.The products are especially suitable as intermediates in carotinoid syntheses.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: October 13, 1992
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Mario Mazzuchelli, Milan Soukup, Paul Spurr, Claude Stritt