Patents by Inventor Katsuhiro Sonoda

Katsuhiro Sonoda 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).

  • Ball screwed nut, linearly guiding apparatus using the same, ball screw for steering and method of manufacturing the ball screwed nut
    Patent number: 6334370
    Abstract: A ball rolling groove 1c is defined in an inner peripheral surface of A ball screwed nut 1 by a rolling process, not by a grinding process so that a ball screwed nut having small diameters or large leads can be manufactured. The surface of the ball rolling groove 1c is finished to be sharp without concave and convex by a plastic working by the rolling process, so that the surface is less rough. By rolling the surface by the rolling process excellent in durability, the precision of R shape of the ball rolling groove 1c can be made excellent.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: January 1, 2002
    Assignee: THK Co., Ltd.
    Inventors: Katsuhiro Sonoda, Takeki Shirai, Shigeru Yamanaka