Patents by Inventor Masato Iwawaki

Masato Iwawaki 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 control apparatus including a master control unit and a slave control unit which maintain coherent information
    Patent number: 5870301
    Abstract: In the master control unit, updated information is transferred to a slave control unit and a coherence of information between the master control unit and the slave control unit is periodically checked, thereby eliminating a difference of the internal information of the two units which execute a control, a status monitor, and a maintenance of a computer system in an on-line manner and guaranteeing the coherence. When the master control unit recognizes a difference between the information for a predetermined time or more, the slave control unit is halted and the information of the master control unit is made effective. With respect to an abnormality of the master control unit, the master control unit halts by itself. In this instance, the slave control unit is shifted to the master status and takes over the process.
    Type: Grant
    Filed: January 17, 1996
    Date of Patent: February 9, 1999
    Assignee: Fujitsu Limited
    Inventors: Hiroshi Yakushiji, Tomoko Osaki, Reiko Sato, Masato Iwawaki