Patents by Inventor Roger N. Crathern

Roger N. Crathern 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).

  • Liquid treatment apparatus
    Patent number: 4303517
    Abstract: The apparatus includes a tank of steel, or concrete, into which the liquid to be treated is introduced vertically through a centrally located inlet at the tank bottom. Disposed inside the tank, above said inlet, are a tubular venturi-type eductor member and a conical partition member which defines a liquid mixing, coagulating, flocculating and sludge recirculating zone. As the entering liquid flows through the eductor, it draws in a very large volume of surrounding sludge to establish a high degree of sludge recirculation and mixing.
    Type: Grant
    Filed: December 1, 1980
    Date of Patent: December 1, 1981
    Assignee: Sydlo Inc.
    Inventors: Leonard S. Love, Roger N. Crathern