Patents Represented by Attorney Lloyd W. Massey

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  • Self-cleaning non-return drainage valve
    Patent number: 4059127
    Abstract: A non-return drainage valve adapted for use with a container for drainage of fluids from the container through the valve and for prevention of the passage of liquid into the container, the valve including a buoyant plug member and probe means movable with the plug member for clearing debris from the valve.
    Type: Grant
    Filed: February 27, 1976
    Date of Patent: November 22, 1977
    Inventor: Leonard J. Olson