Patents by Inventor Kohmei Yamaguchi

Kohmei Yamaguchi 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).

  • Mercury switch
    Patent number: 4368442
    Abstract: A mercury switch in which a magnetic armature and a magnetic pole having a fixed contact are inserted in a glass tube, mercury is introduced into the glass tube to wet the contact point, and both ends of the glass tube are sealed. A recessed portion is formed in a portion of the magnetic pole and the fixed contact is adhered into the recessed portion. A film of a metal oxide which will be only slightly wetted with mercury is formed on the surface of the magnetic pole except on the surface of the fixed contact.
    Type: Grant
    Filed: December 8, 1980
    Date of Patent: January 11, 1983
    Assignee: Fujitsu Limited
    Inventors: Kohmei Yamaguchi, Kazuo Kobayashi, Takeo Furukawa