Patents by Inventor Gayle G. Chany

Gayle G. Chany 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).

  • Preparation of 1,1,1,3,3,3-hexafluoro-2,2-Di(3,4-dicarboxyphenyl)propane anhydride
    Patent number: 5194633
    Abstract: A process for preparing 1,1,1,3,3,3-hexafluoro-2,2-di(3,4-dicarboxyphenyl) propane anhydride is disclosed. 1,1,1,3,3,3-hexafluoro-2,2-di(3,4 -dimethylphenyl) propane is oxidized under liquid phase conditions in the presence of an oxygen-containing gas, bromine and heavy metal catalyst components to 1,1,1,3,3,3-hexafluoro-2,2-di(3,4-dicarboxyphenyl) propane in high yield. Addition of an anhydride of a low molecular weight carboxylic acid to the oxidation reaction mixture converts the 1,1,1-hexafluoro-2,2-di(3,4-dicarboxyphenyl)propane to 1,1,1,3,3,3-hexafluoro-2,2-di(3,4-dicarboxyphenyl) propane anhydride.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: March 16, 1993
    Assignee: Amoco Corporation
    Inventors: Walter Partenheimer, Douglas E. Fjare, Gayle G. Chany