Patents by Inventor Ivan K. Marvakov

Ivan K. Marvakov 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).

  • D.C. impulse arc welder employing thyristors
    Patent number: 4628427
    Abstract: Apparatus for producing an impulse welding current which can be used in shielded-arc welding. The apparatus includes a thyristor connector in a series circuit to a primary winding of an impulse transformer and a second thyristor and a compacitor, the secondary winding of the impulse transformer being connected to a diode to the welding arc. The apparatus increases the coefficient of the impulse welding current and reduces the steepness of the positive fronts of the voltage imposed upon the thyristors.
    Type: Grant
    Filed: June 7, 1985
    Date of Patent: December 9, 1986
    Assignee: ZNIKA
    Inventors: Ivan K. Marvakov, Todor Y. Russev