Patents by Inventor Lawrence Lu Kuo

Lawrence Lu Kuo 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).

  • Production of paper and paperboard
    Patent number: 6273998
    Abstract: A drainage/retention aid comprising a combination of a) microparticles; and b) a vinylamine copolymer having the general structure: wherein m is from 1-99 mol %, n is from 0 to 50 mol % and o is from 1 to 99 mol %; A is selected from the group consisting of one or more repeating units having the following general structures: and salts thereof wherein p, q and r are mol percentages from 1 to 99, each R1 is independently H or CH3, and X is —CN, —COOR2, —CONR3R4, —OR5, —OCOR6, and mixtures thereof; wherein R2, R3, R4, R5, R6 are independently selected from H or C1 to C4 alkyl; and wherein the vinylamine copolymer has a charge density in a range of from 2 to 24 mEq/g.
    Type: Grant
    Filed: August 16, 1994
    Date of Patent: August 14, 2001
    Assignee: Betzdearborn Inc.
    Inventors: Lawrence Lu Kuo, Roger Yiming Leung, Steven R. Prescott, Thord Hassler
  • Cement admixture product having improved rheological properties and process of forming same
    Patent number: 5728207
    Abstract: The present invention is directed to an imidized polycarboxylic acid polymer useful as a cement admixture, to improved cement compositions containing said polymer and to a process of forming the same.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: March 17, 1998
    Assignee: W.R. Grace & Co.-Conn.
    Inventors: Ahmad Arfaei, David Charles Darwin, Ellis Martin Gartner, Byong-Wa Chun, Hideo Koyata, Lawrence Lu Kuo
  • Water-soluble cationic copolymers and their use as flocculants
    Patent number: 5720888
    Abstract: A method of flocculating coagulated and/or finely divided suspended matter in aqueous systems comprising adding to the system from 0.005 to 1 weight percent based on the dry weight of the coagulated and/or finely suspended matter of at least one water soluble cationic polymer selected from a water soluble cationic copolymer (I) composed of the polymerization reaction of an N-vinylamide with at least one cationic quaternary amine monomer.
    Type: Grant
    Filed: December 16, 1996
    Date of Patent: February 24, 1998
    Assignee: BetzDearborn Inc.
    Inventors: Lawrence Lu Kuo, Roger Yiming Leung
  • Water-soluble cationic copolymers and their use as flocculants and drainage aids
    Patent number: 5700893
    Abstract: A water-soluble cationic copolymer comprising a reaction product of N-vinylamide having the general formula: ##STR1## and a cationic quaternary amine having the formula: ##STR2## wherein Y is C(.dbd.O)O(CH.sub.2).sub.n N.sup..sym. R.sup.4 R.sup.5 R.sup.6 X.sup..crclbar., or ##STR3## X.sup..crclbar.,n is 1 to 5; R.sup.1, R.sup.2, R.sup.3 are independently H or C.sub.1 to C.sub.3 alkyl, R.sup.4, R.sup.5, and R.sup.6 are independently C.sub.1 to C.sub.3 alkyl, X is a halide, hydroxyl or alkylsulfate anion.The copolymers of this invention are useful as flocculating agents, and are particularly useful as drainage/retention aids in pulp and papermaking operations.
    Type: Grant
    Filed: April 18, 1995
    Date of Patent: December 23, 1997
    Assignee: BetzDearborn Inc.
    Inventors: Lawrence Lu Kuo, Roger Yiming Leung, Kenneth Samuel Williams
  • Water-soluble cationic copolymers and their use as flocculants and drainage retention aids
    Patent number: 5681912
    Abstract: A water-soluble cationic copolymer having the general formula: ##STR1## wherein Z represents --C(.dbd.O)O(CH.sub.2).sub.n N.sup..sym. R.sup.4 R.sup.5 R.sup.6 X.sup..crclbar., --C(.dbd.O)NH(CH.sub.2).sub.n N.sup..sym. R.sup.4 R.sup.5 R.sup.6 X.sup..crclbar., ##STR2## or residual groups of --CH.sub.2 N.sup..sym. (R.sup.4 R.sup.5)CH.sub.2 CH.dbd.CH.sub.2 X.sup..crclbar. or mixtures thereof, and n is 1 to 5; R.sup.1, R.sup.2 and R.sup.3 are independently selected from the group consisting of H or C.sub.1 to C.sub.3 alkyl; R.sup.4, R.sup.5 and R.sup.6 are independently C.sub.1 to C.sub.3 alkyl; and X is a halide, hydroxyl or alkylsulfate anion; and wherein x, y, and q represent molar percents of monomeric units in the copolymer such that q is 1 to 99 mol %, and the molar ratio of x to y is from 0 to 10.The copolymers of this invention are useful as flocculating agents and as drainage/retention aids in pulp and papermaking operations.
    Type: Grant
    Filed: September 6, 1995
    Date of Patent: October 28, 1997
    Assignee: BetzDearborn Inc.
    Inventors: Lawrence Lu Kuo, Roger Yiming Leung, Kenneth Samuel Williams
  • Cement admixture product having improved rheological properties and process of forming same
    Patent number: 5643978
    Abstract: The present invention is directed to an imidized polycarboxylic acid polymer useful as a cement admixture, to improved cement compositions containing said polymer and to a process of forming the same.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 1, 1997
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: David Charles Darwin, Ellis Martin Gartner, Byong-Wa Chun, Hideo Koyata, Lawrence Lu Kuo