Patents by Inventor Masayoshi Yatabe

Masayoshi Yatabe 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).

  • Sintered hard metal having superior toughness
    Patent number: 4753678
    Abstract: A sintered hard metal having superior toughness and superior hardness may be used for micro-drills, tools and wear resistant parts. The metal is a cemented carbide WC formed from tungsten carbide WC as the base alloy and containing 4 to 20 percent by weight of vanadium carbide VC or zirconium nitride. Its micro-structure is that the WC or WC-VC particles are 0.6.mu. or less, its Rockwell Hardness HRA is at least 91.5 and its transverse rupture strength is at least 350 kg/mm.sup.2.
    Type: Grant
    Filed: February 25, 1986
    Date of Patent: June 28, 1988
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Masao Maruyama, Atsushi Seki, Masayoshi Yatabe, Kotaro Hagiwara