Patents by Inventor Shinichi Kobayasji

Shinichi Kobayasji 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 for assessing remaining lifespan of bolt used at high temperatures
    Patent number: 8225672
    Abstract: The present invention is intended to provide a method for assessing remaining lifespan of a bolt with higher precision than conventional methods, which can be applied to a bolt comprising a high alloy with fewer tissue changes caused by creep damage. The present invention provides a method for assessing the remaining lifespan of a bolt used at high temperatures, including: carrying out a creep test for a bolt material that constitutes a bolt to be assessed and determining a life-time and a life-elongation rate; determining a time-temperature parameter based on the life-time and the creep test temperature; creating a lifespan-assessment diagram by plotting the time-temperature parameter with respect to the life-elongation rate; measuring a elongation rate between before and after the use of the bolt to be assessed; and assessing the remaining lifespan of the bolt with the use of the elongation rate between before and after the use of the bolt to be assessed and the lifespan-assessment diagram.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: July 24, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Arai, Shinichi Kobayasji, Hiroyuki Doi, Hiroaki Chiba, Takashi Haneishi