Patents by Inventor Alexandr K. Kharchenko

Alexandr K. Kharchenko 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).

  • Machine for resistance butt welding of pipes
    Patent number: 4885450
    Abstract: The machine of the invention, intended for resistance butt welding of pipes, comprises two semi-housings mounted externally on the pipes to be welded to the opposite sides of a joint and interconnected by the flash and upset drive, a clamping device mounted in each semihousing, including radially arranged hydraulic cylinders with clamping shoes, and a control system of the hydraulic cylinders.The control system of the hydraulic cylinders includes control valve units structurally associated with the piston rods of the hydraulic cylinders. The control valve units include follow-up spool valves interconnected by their common actuator linkage.
    Type: Grant
    Filed: December 16, 1988
    Date of Patent: December 5, 1989
    Inventors: Boris E. Paton, Vladimir K. Lebedev, Sergei I. Kuchuk-Yatsenko, Vasily A. Sakharnov, Alexandr K. Kharchenko, Mikhail R. Unigovsky