Patents by Inventor Tsuyoshi Kohoka

Tsuyoshi Kohoka 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).

  • Steel for machine construction having excellent cold forgeability and machinability
    Patent number: 4431445
    Abstract: A steel for machine construction having excellent cold forgeability and machinability, the steel having a composition of below 0.6% C, below 0.35% Si, below 1.65% Mn, below 3.5% Ni, below 3.5% Cr, below 0.35% Mn, 0.010-0.10% Al and below 0.002% B, the rest being Fe and impurities with limited contents of Ca in the range of 0.0005-0.05%, S of below 0.12% and Al.sub.2 O.sub.3 inclusion of below 0.002%.
    Type: Grant
    Filed: July 9, 1981
    Date of Patent: February 14, 1984
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Sadayoshi Furusawa, Hideo Takeshita, Tsuyoshi Kohoka, Jiro Koarai, Shuji Iwata