Patents by Inventor Hisao Ohtsuka

Hisao Ohtsuka 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 diagnosing a remaining lifetime, apparatus for diagnosing a remaining lifetime, method for displaying remaining lifetime data, display apparatus and expert system
    Patent number: 5608845
    Abstract: In a method for determining a remaining lifetime of an aggregate constructed of a plurality of components and having at least one function, and an apparatus thereof, a first remaining lifetime of the aggregate is acquired based upon experimental aging degradation data on one characteristic of at least one component of the aggregate; a second remaining lifetime of the aggregate is acquired based upon experimental aging data with respect to at least one function of the aggregate; a third remaining lifetime of the aggregate is acquired based on both the experimental aging degradation data on the one characteristic of at least one component of the aggregate and the experimental aging data on at least one function of the aggregate; and, a remaining lifetime having the shortest lifetime from the first through third remaining lifetimes is output as the remaining lifetime of the aggregate.
    Type: Grant
    Filed: November 29, 1993
    Date of Patent: March 4, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Hisao Ohtsuka, Motoaki Utamura