Patents by Inventor Yasuhiko Matsuura

Yasuhiko Matsuura 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).

  • Dynamic memory diagnosis and error correction apparatus
    Patent number: 4694454
    Abstract: In a certain refresh cycle, a certain address is designated as a refresh address, and a read operation for the refresh is conducted. The data thus read out is checked, and, if a correctable error is detected, the corrected data and its address are held in a corrected data register and an address register, respectively. In the succeeding refresh cycles, reading operations for the refresh are conducted for the succeeding addresses. When the same address as that held in the address register is designated again in due time as the refresh address, a writing operation for the refresh is conducted to write back the content of the corrected data register.
    Type: Grant
    Filed: July 29, 1985
    Date of Patent: September 15, 1987
    Assignee: Hitachi, Ltd.
    Inventor: Yasuhiko Matsuura