Patents by Inventor Katsuro Yamasaki

Katsuro Yamasaki 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).

  • Patent number: 4000011
    Abstract: A method of surface hardening for forming a hardened layer of cemented carbide, including cementite, on a local surface area of cast iron by rapidly melting the local surface by means of a rapid melting process such as the electron bombardment melting process to form a molten pool thereon, then rapidly cooling the molten pool by the chilling effect of the non-molten portion of cast iron and finally finishing the cast iron having the hardened layer thus formed to a desired shape. To this end, the cast iron used contains therein one or a mixture of deoxidizing agents such as aluminum, magnesium and calcium.
    Type: Grant
    Filed: September 7, 1972
    Date of Patent: December 28, 1976
    Assignees: Toyo Kogyo Co., Ltd., Yoshiwa Kogyo Kabushiki Kaisha
    Inventors: Nobuaki Sato, Katsuro Yamasaki