Patents by Inventor Christian M. Roussel

Christian M. Roussel 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 preparing pyrylium salts
    Patent number: 4642359
    Abstract: A process for selectively preparing isomers of polysubstituted pyrylium salts from isoolefins or isoolefin precursors comprises diacylating the isoolefin or isoolefin precursor with a carboxylic acid anhydride in the presence of an acid having a Hammett acidity function, at about 22.degree.-25.degree. C. when pure, between -10 and -5. This method is selective to obtain the most substituted isomer of pyrylium salt that can be obtained from the isoolefin or isoolefin precursor.
    Type: Grant
    Filed: December 10, 1984
    Date of Patent: February 10, 1987
    Assignee: Eastman Kodak Company
    Inventors: Harivelo G. Rajoharison, Christian M. Roussel