Patents by Inventor Kazuo Tokui

Kazuo Tokui 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).

  • Proximity detector
    Patent number: 4191894
    Abstract: A proximity detector including a pair of antennae disposed at the front edge of a door with a space; and voltage converters for converting earth electrostatic capacities of the antennae to the corresponding voltages. The proximity detector further includes a first detecting circuit for detecting a differential signal of the outputs of the voltage converters; and a second detecting circuit for detecting a summing signal of the outputs of the voltage converters. The movement of the door is controlled by the output of the first detecting circuit and/or the output of the second detecting circuit.
    Type: Grant
    Filed: November 18, 1977
    Date of Patent: March 4, 1980
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masahiro Noda, Kazuo Tokui