Patents by Inventor Fumiyasu Banba

Fumiyasu Banba 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).

  • System for retrieving distributed information in a data base
    Patent number: 4803614
    Abstract: A distributed information retrieval system in which the central computer is connected to a plurality of terminal devices and the management information includes a set of retrieval keys kept on the central computer side where the primary retrieval is achieved. The secondary retrieval thereafter is executed on the terminal side to reduce the load imposed on the central computer and to improve the response time for forwarding an answer to the user of the retrieval system.
    Type: Grant
    Filed: February 11, 1986
    Date of Patent: February 7, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Fumiyasu Banba, Yoshinori Okami
  • Memory system
    Patent number: 4558446
    Abstract: In prior art memory systems, if a defective area of the recording medium is accessed for reading, an alternative area for compensating the defective area is read out. According to this invention, information recorded in the alternative area is stored in advance in a separate high-speed memory device and it is read out when the alternative area is requested to be read out.
    Type: Grant
    Filed: May 4, 1983
    Date of Patent: December 10, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Fumiyasu Banba, Mikito Ogata