Patents Assigned to Nihon Rokaki, Kabushiki Kaisha
  • Device for detecting the clogging of strainer filter
    Patent number: 3992296
    Abstract: A hemispherical, transparent cover is provided in which a bellows having substantially the same hemispherical configuration is provided. A liquid having a different color than that of the bellows is filled between said transparent cover and the bellows whereby a difference in color may be perceptible from the outside of the transparent cover, depending on the pressure differential between the inlet side and outlet side of a strainer caused by clogging of its filter.
    Type: Grant
    Filed: June 25, 1975
    Date of Patent: November 16, 1976
    Assignee: Nihon Rokaki, Kabushiki Kaisha
    Inventor: Kouji Nobuta