Patents by Inventor Tetsufumi Yoshida

Tetsufumi Yoshida 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).

  • Punching method using punch and punch for punching
    Patent number: 8387494
    Abstract: An object of the present invention is to provide a punching method using a punch, which makes it possible to effectively improve the durability of a tooth portion of the punch. In a punching method using a punch for forming a through-hole in a workpiece by punching the workpiece using a punch, at least a tooth portion of the punch is made substantially solid when the workpiece is punched by the punch, and the tooth portion is made substantially hollow, thereby a diameter of the tooth portion is reduced by a reaction force received from the workpiece, when the workpiece is separated from the punch after the punching of the workpiece.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: March 5, 2013
    Assignees: Musashi Seimitsu Industry Co., Ltd., Nichidai Corporation
    Inventors: Shinichi Murata, Tetsufumi Yoshida
  • Punching method using punch and punch for punching
    Publication number: 20090229432
    Abstract: An object of the present invention is to provide a punching method using a punch, which makes it possible to effectively improve the durability of a tooth portion of the punch. In a punching method using a punch for forming a through-hole in a workpiece by punching the workpiece using a punch, at least a tooth portion of the punch is made substantially solid when the workpiece is punched by the punch, and the tooth portion is made substantially hollow, thereby a diameter of the tooth portion is reduced by a reaction force received from the workpiece, when the workpiece is separated from the punch after the punching of the workpiece.
    Type: Application
    Filed: March 10, 2009
    Publication date: September 17, 2009
    Applicants: Musashi Seimitsu Industry Co., Ltd., Nichidai Corporation
    Inventors: Shinichi Murata, Tetsufumi Yoshida