Patents by Inventor Vladimir N. Alexandrov

Vladimir N. Alexandrov 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).

  • Directly heated meshed cathode for electronic tubes and method of making
    Patent number: 4443735
    Abstract: In a directly heated meshed cathode made of one metal piece in the form of a hollow cylinder, the working surface is constituted by intersecting helical filaments 3 and 4 with holes 5 therebetween, each filament 3 and 4 being formed with a stepped increase in the width from periphery to center of the cathode.A method of making the meshed cathode comprises fabrication of a tool electrode out of a plate by electroerosive cutting of grooves in the end portion of the plate with projections therebetween shaped to match the holes 5 between the filaments 3 and 4, and electroerosive broaching, using this tool electrode, of longitudinal rows of holes 5 in a hollow cylindrical blank rotatably displaced, after each pass of the tool electrode, through an angle equal to twice the angular distance between the center lines of adjacent longitudinal rows of holes 5 in the cathode.
    Type: Grant
    Filed: October 2, 1981
    Date of Patent: April 17, 1984
    Inventors: Vladimir N. Alexandrov, Vladimir F. Ioffe, Oleg V. Filatov