Patents Represented by Attorney P. W. Leuzzi, II

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  • Gas phase polymerization employing unsupported catalysts
    Patent number: 5744556
    Abstract: A process for the gas-phase polymerization of polymers which allows for the introduction of an unsupported polymerization catalyst system into the gas-phase reactor, wherein the unsupported polymerization catalyst system comprises (i) a non-volatile materials fraction containing a polymerization catalyst; (ii) a solvent fraction which is at least partially miscible with the non-volatile materials fraction and which is sufficiently volatile to allow for the formation of polymerization catalyst particles when the mixture of the solvent fraction and the non-volatile materials fraction is sprayed into the reactor; (iii) a compressed fluid; and (iv) optionally a slowly vaporizing solvent.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: April 28, 1998
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: George Ernest Keller, Keith Ernest Carmichael, Jean Bowman Cropley, Eldon Ronald Larsen, Arakalud Venkatapathia Ramamurthy, Mark Wilton Smale, Timothy Todd Wenzel, Clark Curtis Williams
  • Selective flocculation for increased coal recovery by froth flotation
    Patent number: 4268379
    Abstract: The use of a selective cationic polymeric flocculant in conjunction with froth flotation of coal results in increased coal recovery.
    Type: Grant
    Filed: December 23, 1977
    Date of Patent: May 19, 1981
    Assignee: American Cyanamid Company
    Inventors: Andrew C. Poulos, John D. Hightower