Patents by Inventor Eiji Tatsukawa

Eiji Tatsukawa 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).

  • Buffer control method for quickly determining whether a required data block is in the buffer
    Patent number: 4839799
    Abstract: In an information processing method and system including a secondary storage, a primary storage for storing data blocks of the secondary storage and a directory containing control information for the data blocks stored in the primary storage, the directory is consulted to determine whether a desired data block is in the primary storage, and if it is, the data block is read from the primary storage. The control information of the directory contains pairs of addresses on the primary storage of the data blocks stored in the primary storage and the addresses on the secondary storage.
    Type: Grant
    Filed: July 24, 1986
    Date of Patent: June 13, 1989
    Assignees: Hitachi, Ltd., Hitachi Computer Consultant, Ltd.
    Inventors: Masami Takahashi, Eiji Tatsukawa, Shunichi Torii, Keiji Kojima