Patents by Inventor Norikatsu Yokota

Norikatsu Yokota 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).

  • Cold trap
    Patent number: 4893792
    Abstract: This invention relates to a cold trap for collecting impurities from liquid, which comprises a mesh screen and a spacer mesh having higher strength and wider mesh holes than that of the mesh screen interposed between the windings of the mesh screen. According to the present invention, since the spacer mesh supports the mesh screen over the whole surface thereof so that the mesh screen is protected free from break or deformation, the stiffness and collecting efficiency of the mesh section can be maintained prolongedly.
    Type: Grant
    Filed: November 9, 1988
    Date of Patent: January 16, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Kiyomitsu Nemoto, Norikatsu Yokota, Yoshihiko Sato, Shigehiro Shimoyashiki, Kenji Mokuya, Hiroshi Haino