Patents by Inventor Hitoshi Rokutannda

Hitoshi Rokutannda 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).

  • Shot peening method and device therefor
    Patent number: 6449998
    Abstract: The present invention provides a method for a shot-peening processing that can process in one step and thus reduce operating costs and the cost of equipment while increasing the efficiency of the treatment in the peening processing while achieving a peening effect similar to the effect obtained by shot-peening processing a plural number of times, that is, deeply generating compressive residual stress far from the top surface while generating the peak value of the compressive residual stress on the top surface. This method is characterized by projecting, on a product to be subjected to peening, shot in which two or three kinds of particles, each having a different predetermined average particle diameter and having a predetermined average particle diameter ratio to one another, are combined in a predetermined weight ratio.
    Type: Grant
    Filed: September 21, 2001
    Date of Patent: September 17, 2002
    Assignee: Sintokogio, Ltd.
    Inventors: Hitoshi Takeda, Kunio Ohta, Hitoshi Rokutannda