Patents by Inventor Tadashi Amakasu

Tadashi Amakasu 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).

  • Line switching control system for mobile communication
    Patent number: 4823373
    Abstract: A line switching control system effects switching between a data communication mode and a voice communication mode in mobile communication, particularly mobile telephone service. The line switching control system includes a transmitter/receiver unit for transmitting and receiving signals through an antenna, an input device combined with a telephone, a switching device for effecting switching between the data communication mode and the voice communication mode, and a control unit for controlling switching between the data communication mode and the voice communication mode based on a mode switching command entered through the input device. When a key of the input device at the user's hand is depressed, switching between the data communication mode and the voice communication mode can smoothly be performed.
    Type: Grant
    Filed: October 16, 1987
    Date of Patent: April 18, 1989
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Chusei Takahashi, Tadashi Amakasu, Hiroshi Etoh