Patents by Inventor Hiromasa Hosono

Hiromasa Hosono 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 thread rolling a screw shaft
    Patent number: 5743123
    Abstract: In a method of thread rolling a screw shaft, an inclining portion 1c is provided between a machining portion 1a of a screw shaft 1 and a non-machining portion 1b thereof as well as a taper portion 2b is formed to screw groove forming dies 2, by which a machining load concentrating at the thread rolling portion on the end of the dies adjacent a chuck can be reduced. With this method, the screw shaft can be thread rolled to have straightness of high quality.
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: April 28, 1998
    Assignee: Mitsuba Corporation
    Inventors: Masatoshi Yamamoto, Hiromasa Hosono