Patents by Inventor Katsuhiko Tayama

Katsuhiko Tayama 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).

  • Method for making shadow masks
    Patent number: 4325752
    Abstract: Al killed cold rolled sheet is manufactured. The sheet is composed ofC: less than 0.01%, Mn: 0.10-1.00%, S: less than 0.025%, Sol.Al: 0.010-0.120%, N: less than 100 ppm, balance being Fe and impurities.The above N and Sol. Al are in relation of Sol.Al/N.times.14/27.gtoreq.1.5 and most of the N is further fixed as AlN. The Al killed cold rolled sheet is re-rolled to a thickness below 0.2 mm and bored by photo-etching. Then the sheet is finally annealed in a decarburizing atmosphere at temperatures in the range of 650-850.degree. C. for 1-30 minutes, preferably 1-10 minutes. Subsequently the sheet is subjected to a leveling process and press forming to form a shadow mask for color TV.
    Type: Grant
    Filed: August 13, 1980
    Date of Patent: April 20, 1982
    Assignees: Nippon Kokan Kabushiki Kaisha, Nippon Mining Co., Ltd.
    Inventors: Toyoharu Suda, Katsuhiko Tayama, Kenji Araki, Masayuki Kurata, Hideo Yamana