Patents by Inventor Katsuyoshi Sakoda

Katsuyoshi Sakoda 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 forging precipitation hardening type stainless steel
    Patent number: 6478900
    Abstract: An improved method of forging a precipitation hardening type stainless steel. The method comprises the steps of soaking the precipitation hardening type stainless steel at a temperature of austenitizing range, cooling the steel to a temperature in the range of 200-700° C., preferably 400-600° C., and subjecting the steel to forging at the temperature in this range. Conventional lubricants and die cooling oils can be used without being deteriorated due to high temperature. It is preferable to forcibly cool the soaked steel to adjust the temperature of the steel at which it is forged. The forged steel is then age hardened to exhibit inherent hardness.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: November 12, 2002
    Assignee: Diado Tokushuko Kabushiki Kaisha
    Inventors: Sachihiro Isogawa, Masamichi Kawano, Katsuyoshi Sakoda