Patents by Inventor Yooji Yamaki

Yooji Yamaki 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).

  • Method of repairing semiconductor memory
    Patent number: 4627053
    Abstract: In a method of repairing a semiconductor memory device having spare lines, all possible solutions of remedy using spare lines or spare blocks are obtained based on the result of test for the device, and then the possible solutions are screened under conditions related to the quality and reliability of the device so as to determine the best solution.
    Type: Grant
    Filed: March 30, 1984
    Date of Patent: December 2, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Yooji Yamaki, Shigenori Sakai