Patents by Inventor Akira Yumoto

Akira Yumoto 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
    Patent number: 4881203
    Abstract: A semiconductor memory device wherein a group of multiple memory cells is divided into a plurality of memory cell blocks, and the output of each memory cell block is connected to a main data line. This memory device is adapted for increasing the data read speed.
    Type: Grant
    Filed: March 15, 1988
    Date of Patent: November 14, 1989
    Assignee: Sony Corporation
    Inventors: Kazuo Watanabe, Akira Yumoto