Patents by Inventor Hironao Nagayoshi

Hironao Nagayoshi 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).

  • Flash memory capable of storing frequently rewritten data
    Patent number: 6839798
    Abstract: A flash memory includes an address information storage and a data write unit. The address information storage records address information about blank areas in a cluster consisting of a plurality of sectors. The data write unit writes, in response to a write request of data, data into at least one of the blank areas by referring to the address information about the blank areas. This makes it possible to solve a problem that occurs with a conventional flash memory. In particular, the number of erasable times of the improved flash memory is not limited to about one tenth of that of an EEPROM, and hence the improved flash memory can store frequently rewritten data.
    Type: Grant
    Filed: May 26, 1999
    Date of Patent: January 4, 2005
    Assignees: Renesas Technology Corp., Mitsubishi Electric Semiconductor Application Engineering Corp.
    Inventors: Hironao Nagayoshi, Shinichi Ishimoto