Patents by Inventor Yasumasa Ishiwata

Yasumasa Ishiwata 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).

  • Mobile terminal position information detection method and system using the method
    Patent number: 5502758
    Abstract: A mobile terminal position information display system which detects accurate information on a position between a radio controller and a radio telephone and displays the position and locus of movement of the radio telephone. The system includes one or more mobile terminals which make communication by radio to output signals indicative of their positions; one or more mobile terminal control units for transmitting/receiving a signal to/from a mobile terminal, at least one exchange to which a mobile terminal control unit is connected, and an output processor including an analyzer for analyzing the signal indicative of the position of the mobile terminal from the reporting unit to output information on the position of the mobile terminal. The mobile terminal control units each include a detector for detecting a signal indicative of the position of a mobile terminal.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: March 26, 1996
    Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., Ltd.
    Inventors: Takuo Tsuzuki, Yasuhide Tabuchi, Yasumasa Ishiwata
  • Mobile termainal position information detection method and system using the method
    Patent number: 5434904
    Abstract: A mobile terminal position information display system which detects accurate information on a position between a radio controller and a radio telephone and displays the position and locus of movement of the radio telephone. The system includes one or more mobile terminals which make communication by radio to output signals indicative of their positions; one or more mobile terminal control units for transmitting/receiving a signal to/from a mobile terminal, at least one exchange to which a mobile terminal control unit is connected, and an output processor including an analyzer for analyzing the signal indicative of the position of the mobile terminal from the reporting unit to output information on the position of the mobile terminal. The mobile terminal control units each include a detector for detecting a signal indicative of the position of a mobile terminal.
    Type: Grant
    Filed: July 21, 1993
    Date of Patent: July 18, 1995
    Assignees: Hitachi, Ltd., Hitachi Software Engineering Co., Ltd.
    Inventors: Takuo Tsuzuki, Yasuhide Tabuchi, Yasumasa Ishiwata