Patents by Inventor Kiyoshi Kawana

Kiyoshi Kawana 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).

  • Passenger number sensor system
    Patent number: 5068537
    Abstract: A passenger-number sensor system wherein a plurality of infrared ray sensors are disposed on a straight line to detect temperature changes in their light reception zones, a plurality of optical lenses are provided one for each of the plurality of infrared ray sensors, and a counter is provided to select one of the addition values in a predetermined range according to a sense pattern based on the temperature changes of the infrared ray sensors and add the selected addition value to a so-far accumulated count value.
    Type: Grant
    Filed: March 14, 1991
    Date of Patent: November 26, 1991
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Haruo Ishikawa, Kiyoshi Kawana, Ko Honma, Takashi Yoshikawa