Patents by Inventor Mitsushi Higuchi

Mitsushi Higuchi 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 of manufacturing high strength blank a bolt
    Patent number: 4838961
    Abstract: A high strength bolt made of a steel having a specifically defined chemical composition, i.e., by weight C: 0.30-0.50%; Si: not more than 0.15%; Mn: not more than 0.40%; Cr: 0.30-1.50%; Mo: 0.10-0.70%; and V: 0.15-0.40%, the balance being Fe and inevitable impurities such as P, S, etc. in trace amount. The manufacturing method therefor is featured in a strictly controlled heat treatment in respect to the temperature range such as: hardening by quenching from 940.degree..+-.10.degree. C. and tempering 575.degree..+-.25.degree. C.
    Type: Grant
    Filed: April 8, 1988
    Date of Patent: June 13, 1989
    Assignees: Nagoyo Screw Mfg. Co., Ltd., Daido Tokushuko Kabushiki Kaisha, Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Kazunori Fukizawa, Mitsushi Higuchi, Kunio Namiki
  • High strength bolt
    Patent number: 4778652
    Abstract: A high strength bolt made of a steel having a specifically defined chemical composition, i.e., by weight C: 0.30-0.50%; Si: not more than 0.15%; Mn: not more than 0.40%; Cr: 0.30-1.50%; Mo: 0.10-0.70%; and V: 0.15-0.40%, the balance being Fe and inevitable impurities such as P, S, etc. in trace amount. The manufacturing method therefor is featured in a strictly controlled heat treatment in respect to the temperature range such as: hardening by quenching from 940.degree..+-.10.degree. C. and tempering 575.degree..+-.25.degree. C.
    Type: Grant
    Filed: November 25, 1985
    Date of Patent: October 18, 1988
    Assignees: Honda Giken Kogyo Kabushiki Kaisha, Nagoya Screw Mfg. Co. Ltd, Daido Tokushuko Kabushiki Kaisha
    Inventors: Kazunori Fukizawa, Mitsushi Higuchi, Kunio Namiki