Patents by Inventor Kenneth Guthrie Andrew

Kenneth Guthrie Andrew 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).

  • Removal of phosphorous from waste water
    Patent number: 4043910
    Abstract: Phosphate is removed from an aqueous medium by adding inorganic coagulant followed by a cationic polyelectrolyte which is a water-soluble quaternary ammonium salt of a high molecular weight copolymer of acrylamide and an alkylaminoalkyl ester of acrylic or methacrylic acid. The process is of particular value in reducing the phosphate content of sewage effluent.
    Type: Grant
    Filed: June 3, 1976
    Date of Patent: August 23, 1977
    Assignee: Allied Colloids Limited
    Inventors: John Rodney Field, Kenneth Guthrie Andrew