Patents by Inventor Nikolai Prokhorovich Chepurnoi

Nikolai Prokhorovich Chepurnoi 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).

  • Percussive device for driving holes in soil
    Patent number: 3952813
    Abstract: A percussive device comprising a housing with a pointed front end and a hammer piston accommodated in the housing to form a front working chamber therewith. The hammer piston is provided, in the rear portion thereof, with a cavity in permanent communication with a source of compressed air, the cavity serving as a rear working chamber. An airdistribution mechanism includes a tube mounted in the housing within the hammer piston cavity so that it is conjugated with the walls of the cavity, the piston having air passages therein positioned in such a manner that, during the reciprocation, the tube alternately communicates the front working chamber, via these passages, with either the rear working chamber or ambient atmosphere.
    Type: Grant
    Filed: February 7, 1975
    Date of Patent: April 27, 1976
    Inventors: Nikolai Prokhorovich Chepurnoi, Alexandr Dmitrievich Kostylev, Konstantin Stepanovich Gurkov, Konstantin Konstantinovich Tupitsyn, Sergei Konstantinovich Tupitsyn, Nikolai Grigorievich Nazarov, Vladimir Dmitrievich Plavskikh, Khaim Berkovich Tkach, Evgeny Nikolaevich Cherednikov, Alexandr Nisovich Galbinshtein, Mikhail Vladimirovich Borshtein, Andron Trofimovich Karavaev, Valery Anatolievich Menzorov, Alexei Mikhailovich Makarov