Patents by Inventor Edward Venama

Edward Venama 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).

  • Optimization of polycarbonate preparation by transesterification
    Patent number: 6403754
    Abstract: Acidic impurities in dihydroxyaromatic compounds such as bisphenol A, as illustrated by sulfonic acids and mercaptocarboxylic acids, can have an adverse effect on the molecular weight of a polycarbonate prepared therefrom by transesterification. The same is true of acidic impurities in diaryl carbonates such as diphenyl carbonate, as illustrated by salicylic acid and ferric chloride. The reagents are analyzed for these impurities. Based on the analysis, the reagents are discarded or recycled, or a compensatory amount of alkali metal hydroxide is employed as a catalyst in the reaction.
    Type: Grant
    Filed: January 29, 2001
    Date of Patent: June 11, 2002
    Assignee: General Electric Company
    Inventors: Patrick Joseph McCloskey, Paul Michael Smigelski, Jr., Timothy Brydon Burnell, Juan Rodriques Ordonez, Ignacia Vic Fernandez, Gerardo Hidalgo-Llinas, Rudy Francois Alain J. Peemans, Edward Venama