Patents by Inventor Hideyuki Otaki

Hideyuki Otaki 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).

  • High fatigue screw threads
    Patent number: 4040327
    Abstract: A symmetric screw thread system including external threads each profiled to have a flank angle of (70 .+-. 2).degree. and a flat root located at (0.27 .+-. 0.02)H from an intersecting point of two lines extended from opposing flanks of two adjacent threads and connected to said opposing flanks through arcs of a radius (0.15 .+-. 0.02)p where H is the depth and p is the pitch of the threads. Alternatively, the system may include external threads configured to have a flank angle of (106 .+-. 5).degree. and connected by a root having a radius of (0.30 .+-. 0.01)p.
    Type: Grant
    Filed: September 19, 1975
    Date of Patent: August 9, 1977
    Assignee: Agency of Industrial Science and Technology
    Inventor: Hideyuki Otaki