Patents by Inventor Hidehiro Yamashita

Hidehiro Yamashita 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).

  • Point to Multipoint radiotelephone system
    Patent number: 5644621
    Abstract: A radiotelephone system comprises plural sub units, and a main unit for communicating with the plural sub units. The main unit of the radiotelephone system comprises a first transmitter for transmitting radio signals to the sub units, a first receiver for receiving radio signals from the sub units, chief sub unit determining means for determining the chief sub unit to make radio communications out of the plural sub units, and first communication establishing means for establishing the communications with the chief sub unit determined by the chief sub unit determining means by controlling the first transmitter and second receiver.
    Type: Grant
    Filed: January 10, 1995
    Date of Patent: July 1, 1997
    Assignee: Matsushita Electric Industrial co., Ltd.
    Inventors: Hidehiro Yamashita, Masakazu Tachiyama