Patents by Inventor Katsuki Hazama

Katsuki Hazama 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).

  • Data reading method in semiconductor storage device capable of storing three-or multi-valued data in one memory cell
    Patent number: 5682347
    Abstract: A data reading method in a semiconductor storage device capable of storing three- or multi-valued data in one memory cell, in which the state of each memory cell is classified into a plurality of sets to thereby detect what set the present storage state of the memory cell belongs to. That is, several kinds of voltage values are applied to each memory cell to detect whether a current flows in the memory cell or not in accordance with the magnitude of the voltage values to thereby judge the present storage state of each memory cell.
    Type: Grant
    Filed: February 21, 1996
    Date of Patent: October 28, 1997
    Assignee: Nippon Steel Corporation
    Inventor: Katsuki Hazama
  • Data reading method in semiconductor storage device capable of storing three- or multi-valued data in one memory cell
    Patent number: 5515321
    Abstract: A data reading method in a semiconductor storage device capable of storing three- or multi-valued data in one memory cell, in which the state of each memory cell is classified into a plurality of sets to thereby detect what set the present storage state of the memory cell belongs to. That is, several kinds of voltage values are applied to each memory cell to detect whether a current flows in the memory cell or not in accordance with the magnitude of the voltage values to thereby judge the present storage state of each memory cell.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: May 7, 1996
    Assignee: Nippon Steel Corporation
    Inventor: Katsuki Hazama