Patents Assigned to Kansai Automation Co., Ltd.
  • Level detecting method and its apparatus
    Patent number: 5128656
    Abstract: A level detecting method and apparatus wherein a tubular member with one end open has a stationary wave generating means located within the tubular member. The stationary wave generating means generates stationary waves having a node or antinode at the open end, whereby a switching signal is provided when the open end of the tubular member is completely closed by a measuring object or when the measuring object approaches the open end.
    Type: Grant
    Filed: August 28, 1990
    Date of Patent: July 7, 1992
    Assignee: Kansai Automation Co., Ltd.
    Inventor: Kajiro Watanabe