Patents by Inventor Seiichiro Yokokura

Seiichiro Yokokura 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).

  • Semiconductor memory device having means for monitoring bias voltage
    Patent number: 5444659
    Abstract: A semiconductor memory device having a power supply terminal, a circuit ground, a plurality of memory cells for storing data, bias voltage generating means connected between the power supply terminal and circuit ground, for applying a bias voltage to the memory cells, and monitor means for monitoring the bias voltage.
    Type: Grant
    Filed: August 9, 1994
    Date of Patent: August 22, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Seiichiro Yokokura
  • Non-volatile semiconductor memory device
    Patent number: 5241498
    Abstract: There is a provided non-volatile semiconductor memory device including a memory cell including a source, a drain, a floating gate, and a control gate. To read out data from the memory cell, a voltage of not more than 2 V, obtained by decreasing an external power source voltage, is applied to the drain of the memory cell. Various constants of the memory cell are set so as to control an ON current to be not more than 300 .mu.A when the memory cell is placed in an ON state while a threshold voltage of the memory cell is low.
    Type: Grant
    Filed: July 3, 1990
    Date of Patent: August 31, 1993
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Seiichiro Yokokura