Patents by Inventor Maruyama Tokuji

Maruyama Tokuji 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).

  • Power supply system for consumable electrode arc welding and method of controlling the same
    Patent number: 4877941
    Abstract: A power supply system for consumable electrode arc welding alternately switches between the reverse polarity and the straight polarity. The formation of an arc is detected. A polarity change control signal is generated when the arc duration reaches a predetermined time or when the quantity of charge reaches a predetermined value. The predetermined value of the welding current or voltage is reduced either immediately before or after the change in polarity.
    Type: Grant
    Filed: May 11, 1988
    Date of Patent: October 31, 1989
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Masahiro Honma, Maruyama Tokuji, Masashi Okada, Yukio Hida