Patents by Inventor Humihiko Nakashima

Humihiko Nakashima 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).

  • Microwave plasma ion source
    Patent number: 4393333
    Abstract: A microwave plasma ion source according to the present invention is designed such that a microwave electric field and a magnetic field are applied to a discharge gas introduced into a discharge region, to form plasma, from which ions are extracted. The above magnetic field is formed by means of an electromagnet provided on the low-voltage side of ion extraction electrodes and a high-permeability member provided in that section which is on the side of a waveguide and which permits the microwaves to be propagated freely.
    Type: Grant
    Filed: December 10, 1980
    Date of Patent: July 12, 1983
    Assignee: Hitachi, Ltd.
    Inventors: Noriyuki Sakudo, Katsumi Tokiguchi, Hidemi Koike, Ichiro Kanomata, Humihiko Nakashima