Patents by Inventor Kenkichi Kitajima

Kenkichi Kitajima 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).

  • Lapping method using upper and lower lapping turntables
    Patent number: 5941759
    Abstract: In a lapping apparatus including upper and lower lapping turn tables, and disc-shaped workpiece holding fittings which are held rotatably between the upper and lower lapping turn tables and defines a plurality of receiving holes in which flat workpieces are located in the receiving holes, respectively, and the flat workpieces are lapped while the workpieces are moved together with the workpiece holding fittings relative to the upper and lower lapping turn tables, the thickness of the workpiece holding fittings is set to be thinner than a finished thickness of the workpieces with a difference between the thickness of the workpiece holding fittings and the finished thickness of the workpieces being 70 .mu.m or more.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: August 24, 1999
    Assignee: Shin-Etsu Handotai Co., Ltd.
    Inventors: Kenkichi Kitajima, Kazuo Kubota