Patents by Inventor Jacob J. Prooi

Jacob J. Prooi 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).

  • Unsaturated polyester composition
    Patent number: 4343932
    Abstract: The invention provides unsaturated polyester compositions which can be cured to form flexible objects, which compositions comprise terminal 1,2-alkene dicarboxylic acid in an amount of 1-25, preferably 3-15 mol-percent, calculated on the total amount of dicarboxylic acid, and 1-8, preferably 2.5-6 mol-percent of the dicarboxylic acids in the chain of the polyester consists of trans-1,2-alkene dicarboxylic acid.
    Type: Grant
    Filed: December 10, 1980
    Date of Patent: August 10, 1982
    Assignee: Internationale Octrooi Maatschappij "Octropa" BV
    Inventors: Jacob J. Prooi, Waltherus J. Sep, Wilhelmina Westerhof