Patents by Inventor Yoshiaki Ishimoto

Yoshiaki Ishimoto 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).

  • Shadow mask of braun tube for color TV and process for manufacturing the same
    Patent number: 4306172
    Abstract: A shadow mask of a Braun tube for a color TV made of a steel alloy having the following compositions in weight percent: C.ltoreq.0.12, 0.2.ltoreq.Mn.ltoreq.1.5, 0.3.ltoreq.Si.ltoreq.1.5, 1.0.ltoreq.2Si+Mn, 0.005.ltoreq.Al.ltoreq.0.030, and the balance being Fe and unavoidable impurities. A cold rolled and annealed strip made from such a steel alloy has a Vickers hardness of at least 110 so that it can be easily and satisfactorily processed in the subsequent hole-formation step.
    Type: Grant
    Filed: November 9, 1979
    Date of Patent: December 15, 1981
    Assignees: Nisshin Steel Co., Ltd., Dai Nippon Printing
    Inventors: Takashi Matsukura, Norio Tsukiji, Yoshiaki Ishimoto, Masahiro Shimose, Yasuo Imamura