Patents by Inventor Akitoshi Ohsaki

Akitoshi Ohsaki 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).

  • Memory device to detect and compensate for defective memory cells
    Patent number: 5477492
    Abstract: A memory device includes a redundant data-storage section as a spare for a normal data-storage section so that redundant data-holding circuitry repairs a defective area in normal data-holding circuitry. Data to be written is temporarily stored into a data holding section, and the data thus stored is written into the normal data-storage section and then it is read out immediately after the write operation. If the readout data is different from the initially written data, the destination of the write operation is switched to the redundant data-storage section so that the data held in the data holding section is written into the redundant data-storage section. If there is no discrepancy between these data, the destination of the write operation is then switched to the normal data-storage section so that the data held in the data holding section is written into the normal data-storage section.
    Type: Grant
    Filed: March 23, 1994
    Date of Patent: December 19, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akitoshi Ohsaki, Akira Yamada