Patents by Inventor Yakov Semenovich Vygodsky

Yakov Semenovich Vygodsky 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).

  • Method of preparing polyimides
    Patent number: 3988303
    Abstract: A method of preparing polyimides by polycondensation of diamines and dianhydrides of tetracarboxylic acids in the presence of a catalyst, viz. a carboxylic acid such as acetic, benzoic, a tetracarboxylic acid taken in an amount of from 0.25 to 10, preferably from 0.8 to 2.5 COOH groups per one unit of a polyimide in a polar organic solvent medium which is inert with respect to the starting diamines and dianhydrides and immiscible with water at a temperature within the range of from 100.degree. to 220.degree. C.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: October 26, 1976
    Inventors: Vasily Vladimirovich Korshak, Svetlana Vasilievna Vinogradova, Yakov Semenovich Vygodsky, Zinaida Vasilievna Geraschenko