Patents by Inventor Nobuyoshi Tobita

Nobuyoshi Tobita 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).

  • Equipment for producing high voltage rectifying units
    Patent number: 4128378
    Abstract: Equipment for producing a high voltage rectifying unit wherein there is a resin ingredient tank and a curing agent tank for storing separately the resin ingredient and the curing agent, a closed mixer for mixing the resin ingredient and the curing agent, a vacuum chamber for injecting a mixed thermo-setting resin composition into the high voltage rectifying unit, a chamber for defoaming the injected resin composition, a furnace for curing the injected resin composition by heating, and a carrier apparatus covered to isolate the external atmosphere which may carry the resin composition-injected high voltage rectifying unit from the defoaming chamber to the curing furnace, whereby the procedures from vacuum injection to curing can be carried out continuously and automatically.
    Type: Grant
    Filed: September 26, 1977
    Date of Patent: December 5, 1978
    Assignee: Hitachi, Ltd.
    Inventors: Shinpei Otsu, Akira Sekiguchi, Nobuyoshi Tobita, Shigeru Chikamatsu, Yoshihisa Hosoe, Motoaki Matsui, Noboru Sugimoto, Noriyoshi Totsuka