Patents by Inventor George McGrow

George McGrow 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).

  • Dewatering compositions and processes
    Patent number: 5213693
    Abstract: Sewage sludge and other organic suspensions are prepared for filter press or belt press dewatering by substantially simultaneous treatment with a cationic coagulant polymer and a cationic flocculant polymer. A novel composition comprising a dry blend of the two polymers can then be formed to provide a combined solution for mixing with the suspension.
    Type: Grant
    Filed: October 3, 1991
    Date of Patent: May 25, 1993
    Assignee: Allied Colloids Limited
    Inventors: George McGrow, Peter I. Norman, Peter J. Hoyle
  • Water treatment
    Patent number: 4721574
    Abstract: Polymers having recurring units derived from monomers of formula ICH.sub.2 .dbd.C(R.sup.1) CONHR.sup.2 NR.sup.3 R.sup.4 Iwherein R.sup.1 is hydrogen or methyl, R.sup.2 is straight or branched chain C.sub.2-8 alkylene having at least 2 carbon atoms in the backbone and R.sup.3 and R.sup.4 are independently selected from C.sub.1-4 alkyl, most preferably quaternized dimethylaminopropyl methacrylamide polymers, for instance copolymerized with acrylamide, are used as flocculating agents in processes where the polymer is present during part at least of the process in solution in the presence of free chlorine.
    Type: Grant
    Filed: May 21, 1986
    Date of Patent: January 26, 1988
    Assignee: Allied Colloids Ltd.
    Inventor: George McGrow