Patents by Inventor Mikhail Grigorievich Dunjushkin

Mikhail Grigorievich Dunjushkin 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 cleaning outer surface of pipes of a mainline
    Patent number: 4110862
    Abstract: Apparatus mountable on a pipeline for cleaning the outer surfaces thereof having a self-propelled carriage for travelling axially on the pipeline. The carriage transports two annular casings that are hollow and within each is housed a chain rotor driven rotationally therein as the carriage travels axially on the pipeline. The casings and rotors each have an upper half-ring and a split lower half-ring. As the lower half rings of the casings are opened and closed the chain rotors are opened and closed and the pitch thereof is retained. The casings and rotors therein are constructed so that the split half-rings can be opened sufficiently to pass the pipeline between distal ends of the split rings for allowing mounting and dismounting of the carriage on the pipeline.
    Type: Grant
    Filed: February 18, 1977
    Date of Patent: September 5, 1978
    Inventors: Vladimir Lukyanovich Buzhinsky, Konstantin Egorovich Raschepkin, Mikhail Grigorievich Dunjushkin, Gennady Tikhonovich Lysogorsky, Rustem Ibragimovich Valeev, Yakov Arkadievich Nisenbaum, Deviz Faizrakhmanovich Ikhsanov