Patents by Inventor William R. R. Park

William R. R. Park 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).

  • Method of making hydrophobic copolymers hydrophilic
    Patent number: 5169904
    Abstract: A method for altering a macroporous cross-linked hydrophobic copolymeric lattice produced by precipitation polymerization in a solvent of at least one monounsaturated ester monomer and at least one polyunsaturated ester monomer soluble therein, in order to render the hydrophobic copolymeric lattice hydrophilic. The method involves saponifying the hydrophobic copolymeric lattice by reacting the surface of the hydrophobic copolymeric lattice with an aqueous alkali. The surface can also be rendered hydrophilic by polymerizing an acrylate monomer onto the lattice in order to form a surface containing carboxylic acid sites. The carboxylic acid sites formed on the surface of the lattice are converted to carboxylate anions.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: December 8, 1992
    Assignee: Dow Corning Corporation
    Inventors: Maris J. Ziemelis, William R. R. Park
  • Method of making hydrophobic copolymers hydrophilic
    Patent number: 5135989
    Abstract: A method for altering a macroporous cross-linked hydrophobic copolymeric lattice produced by precipitation polymerization in a solvent of at least one monounsaturated ester monomer and at least one polyunsaturated ester monomer soluble therein, in order to render the hydrophobic copolymeric lattice hydrophilic. The method involves saponifying the hydrophobic copolymeric lattice by reacting the surface of the hydrophobic copolymeric lattice with an aqueous alkali. The surface can also be rendered hydrophilic by polymerizing an acrylate monomer onto the lattice in order to form a surface containing carboxylic acid sites. The carboxylic acid sites formed on the surface of the lattice are converted to carboxylate anions.
    Type: Grant
    Filed: January 4, 1990
    Date of Patent: August 4, 1992
    Assignee: Dow Corning Corporation
    Inventors: Maris J. Ziemelis, William R. R. Park
  • Method of making hydrophobic copolymers hydrophilic
    Patent number: 5026781
    Abstract: A method for altering a macroporous cross-linked hydrophobic copolymeric lattice produced by precipitation polymerization in a solvent of at least one monounsaturated ester monomer and at least one polyunsaturated ester monomer soluble therein, in order to render the hydrophobic copolymeric lattice hydrophilic. The method involves saponifying the hydrophobic copolymeric lattice by reacting the surface of the hydrophobic copolymeric lattice with an aqueous alkali. The surface can also be rendered hydrophilic by polymerizing an acrylate monomer onto the lattice in order to form a surface containing carboxylic acid sites. The carboxylic acid sites formed on the surface of the lattice are converted to carboxylate anions.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: June 25, 1991
    Assignee: Dow Corning Corporation
    Inventors: Maris J. Ziemelis, William R. R. Park
  • Method of making hydrophobic copolymers hydrophilic
    Patent number: 4898913
    Abstract: A method for altering a macroporous cross-linked hydrophobic copolymeric lattice produced by precipitation polymerization in a solvent of at least one monounsaturated ester monomer and at least one polyunsaturated ester monomer soluble therein, in order to render the hydrophobic copolymeric lattice hydrophilic. The method involves saponifying the hydrophobic copolymeric lattice by reacting the surface of the hydrophobic copolymeric lattice with an aqueous alkali. The surface can also be rendered hydrophilic by polymerizing an acrylate monomer onto the lattice in order to form a surface containing carboxylic acid sites. The carboxylic acid sites formed on the surface of the lattice are converted to carboxylate anions.
    Type: Grant
    Filed: April 7, 1989
    Date of Patent: February 6, 1990
    Assignee: Dow Corning Corporation
    Inventors: Maris J. Ziemelis, William R. R. Park