Patents by Inventor Lawerence J. Connelly

Lawerence J. Connelly 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).

  • Hydrophobic polyelectrolyte coagulants for concentrating coal tailings
    Patent number: 5330546
    Abstract: A method for concentrating coal tailings which comprises steps of: feeding the coal tailings to a thickener; treating the coal tailings with a hydrophobic polyelectrolyte copolymer coagulant which comprises diallyldimethylammonium chloride and a more hydrophobic monomer, the coagulant is added to the coal tailings in an amount between about 0.05 to about 0.25 lb/ton; treating the coal tailings with a flocculant in an amount between about 0.05 to about 0.25 lb/ton; discharging substantially concentrated tailing; and withdrawing substantially clarified liquid from the thickener.
    Type: Grant
    Filed: August 18, 1992
    Date of Patent: July 19, 1994
    Assignee: Nalco Chemical Company
    Inventors: Manian Ramesh, Ram A. Venkatadri, Lawerence J. Connelly, Jeffrey R. Cramm