Patents by Inventor Katsunori Hara

Katsunori Hara 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).

  • Flash butt welding apparatus
    Patent number: 4273984
    Abstract: A rectangular waveform voltage is applied between electrodes for welding by using a variable voltage-variable frequency type inverter as the power source for welding whereby the local short-circuit between workpieces can be immediately changed to the flash whereby the fine flash can be continuously generated to remarkably improve the quality of the welded part, and the voltage control can be attained without changing the voltage waveform.
    Type: Grant
    Filed: September 22, 1978
    Date of Patent: June 16, 1981
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Katsunori Hara, Toshihiko Baba, Takio Okuda