Patents by Inventor Norihito Yokota

Norihito Yokota 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 for forming a high-tooth spline of a hollow shaft and hollow shaft having a high-tooth spline
    Patent number: 5829911
    Abstract: A method for forming a high-tooth spline of a hollow shaft which comprises a step of press-inserting a workpiece of a hollow shaft into a die having a spline-shaped internal surface by a punch, for backing up a portion of the workpiece corresponding to the spline-shaped surface of the die from the inside thereof, having a tip portion made of a material having a hardness lower than that of the die, and a step of forming a spline portion on the workpiece. A hollow shaft having a high-tooth spline formed by the above method.
    Type: Grant
    Filed: November 20, 1996
    Date of Patent: November 3, 1998
    Assignees: Aisin Seiki Kabushiki Kaisha, Aisin AI Co., Ltd.
    Inventors: Norihito Yokota, Hiroyuki Ikuta, Hitoshi Nakai