Patents by Inventor Mikio Ohkawa

Mikio Ohkawa 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).

  • Vacuum switch
    Patent number: 4234771
    Abstract: In a vacuum vessel having a vacuum vessel defined by an insulating cylinder and end plates, relatively movable first and second contacts and a bellows, there are provided a first metal plate having a reentrant portion, a second metal plate also having a reentrant portion, and an operating mechanism for separating the contacts which operates such that both contacts are positioned in the reentrant portion of the first metal plate at the time of current interruption and one of the contacts is moved into the reentrant portion of the second metal plate after the current interruption.
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: November 18, 1980
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Mikio Ohkawa, Nobuo Kawashima