Patents by Inventor Sergei A. Rud

Sergei A. Rud 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).

  • Composite piston of positive displacement hydraulic machine and method for manufacturing same
    Patent number: 4494448
    Abstract: A core blank made of a material lighter than that of the piston is placed into a blind hollow of a barrel-shaped piston blank. The composite blank of the piston, thus formed, is subjected to a direct cold straight-through extrusion through a die. A piston is produced wherein the entire surface of the core is congruent with the internal surface of the piston and is in a clearanceless preloaded contact therewith.
    Type: Grant
    Filed: February 23, 1982
    Date of Patent: January 22, 1985
    Assignee: Vsesojuzny Nauchno-Issledovatelsky I Proektno-Konstruktorsky Institut Promyshelennykh Gidroprivodov I Girodoavtomatiki
    Inventors: Vitaly A. Eystratov, Mikhail Y. Elkin, Viktor Y. Danilenko, Ivan M. Stepunin, Nikolai E. Tsenta, Sergei A. Rud, Leonid M. Belferman