Patents by Inventor Alexandr Yakovlevich Medvedev

Alexandr Yakovlevich Medvedev 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).

  • Plasma arc torch
    Patent number: 4055741
    Abstract: A plasma arc torch is of a two-part design and comprises two detachable and tightly joined parts mating with each other of which one part contains an electrode holder with an electrode, a nozzle disposed coaxially of said electrode and having means for supplying an electric current thereto. An insulator is located between said electrode holder and said nozzle, wherein there are also provided passages for the supply of plasma-generating gas and coolant, these being brought out onto the mating surface of the first part. The second part of the torch accommodates means for supplying an electric current to the electrode holder and means for supplying coolant and plasma-generating gas through passages brought out onto the mating surface of the second part so that they match with the corresponding passages of the first part on the surface of the joint thereof.
    Type: Grant
    Filed: December 8, 1975
    Date of Patent: October 25, 1977
    Inventors: David Grigorievich Bykhovsky, Alexandr Yakovlevich Medvedev, Jury Alexandrovich Bogorodsky, Vladimir Nikolaevich Firsov, Yakov Vulfovich Rossomakho
  • Apparatus for plasma working of electrically-conductive materials and method of operating same
    Patent number: 4024373
    Abstract: An apparatus for plasma working of electrically-conductive materials wherein a gas-cooled non-consumable electrode, insulator and a gas-cooled nozzle of a plasmatron are interlinked with one another so as to form a chamber subdivided by a gas-permeable partition so that one of its parts communicates with the atmosphere through a central passage of the nozzle serving to discharge plasma-forming gas and the other part of the chamber communicates with a source of plasma-forming and cooling gas and also with the atmosphere through an additional passage, the non-consumable electrode passing through this partition and being disposed coaxially with the central passage of the nozzle.
    Type: Grant
    Filed: May 5, 1976
    Date of Patent: May 17, 1977
    Inventors: David Grigorievich Bykhovsky, Alexandr Yakovlevich Medvedev
  • Method for striking main arc between the electrode of plasmatron and workpiece, and contrivance embodying same
    Patent number: 3997756
    Abstract: In a method for striking a main arc between the electrode and nozzle of a plasmatron there is initiated with the aid of high-frequency discharge an intermittently-arcing pilot arc whose flame bridges under the influence of a gas fed into the plasmatron the gap between the electrode of plasmatron and workpiece, completing thereby the circuit of main arc. The amplitude of pilot arc current is selected so as to be roughly equal to the steady current of the main arc whereas the frequency and on-off time ratio of the current are selected so as to assure that the flame of pilot arc is sustained unceasingly throughout the arcing of visually-monitored pilot arc.
    Type: Grant
    Filed: June 21, 1974
    Date of Patent: December 14, 1976
    Inventors: David Grigorievich Bykhovsky, Alexandr Yakovlevich Medvedev, Alexandr Yakovlevich Finkelshtein, Jury Alexandrovich Bogorodsky, Mikhail Isaakovich Zax