Patents by Inventor Mikio Matsumoto, deceased

Mikio Matsumoto, deceased 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).

  • Small current detector circuit and locator device using the same
    Patent number: 5783951
    Abstract: Improved small current detector circuit and locator device each comprise a first and a second element in both of which a small current output occurs, a first and a second constant current generator circuit each generating a specified constant current, a first current mirror circuit which is supplied at the input with said output current occurring in said first element and said specified constant current generated from said first constant current generator circuit, and a second current mirror circuit which is supplied at the input with said output current occurring in said second element and said specified constant current generated from said second constant current generator circuit, and wherein either one of said first and second elements is disposed in a detecting portion and a current equal to the current from the output of either one of said first and second current mirror circuits is flowed to the output of the other current mirror circuit such that a detection output corresponding to the difference betw
    Type: Grant
    Filed: October 9, 1996
    Date of Patent: July 21, 1998
    Assignees: Rohm Co., Ltd., Alps Electric Co., Ltd.
    Inventors: Kinya Inoue, Akitoshi Watanabe, Mitsuharu Iwasaki, Mikio Matsumoto, deceased