Patents by Inventor Anatoli Onopchenko

Anatoli Onopchenko 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).

  • Polyamic-acids prepared from 3,3,4,4-benzhydrol tetracarboxylic dianhydride
    Patent number: 3939109
    Abstract: A novel polyamic acid intermediate composition in a polar, aprotic solvent and the corresponding fully condensed polyimide are prepared from 3,3',4,4'-benzhydrol tetracarboxylic dianhydride and a diamine having at least two carbon atoms such as bis(4-aminophenyl)ether.
    Type: Grant
    Filed: December 19, 1974
    Date of Patent: February 17, 1976
    Assignee: Gulf Research & Development Company
    Inventors: Walter P. Barie, Jr., Anatoli Onopchenko, Johann G. D. Schulz