Patents by Inventor Mikhail Dmitrievich Khalyavkin

Mikhail Dmitrievich Khalyavkin 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).

  • Tunnel shield
    Patent number: 3998066
    Abstract: A shield comprises a knife ring with vertical and horizontal partition knives disposed therein for breaking rock. The horizontal partition knives are pivotally connected to the horizontal platforms, adapted to turn in the vertical plane.Each platform is spring-loaded so that when broken rock is loaded on the platform, the latter, under the weight of the rock, tilts downwardly in the vertical plane, and as the surplus rock is being unloaded, the same spring force returns the platform to the initial position.
    Type: Grant
    Filed: February 6, 1975
    Date of Patent: December 21, 1976
    Inventors: Alexandr Nikolaevich Semenov, Vazgen Khorenovich Klorikian, Nariman Alexandrovich Prostov, Mikhail Dmitrievich Khalyavkin, Ilya Emmanuilovich Reznikov, Izmail Makhmudovich Gergokov, Jury Matveevich Gapanovich, Nikolai Pavlovich Evdokimenkov, Josif Davydovich Fishman