Patents by Inventor Huk Y. Cheh

Huk Y. Cheh 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).

  • Free flow electrophoresis method
    Patent number: 5277774
    Abstract: The present invention relates to a free flow electrophoresis method between two ion permeable membranes comprising applying an electric field perpendicular to the primary carrier flow, applying a secondary carrier flow perpendicular to both the primary buffer flow and the electric field, simultaneously reversing the direction of the field and secondary carrier flow, and repeating the previous step until effective separation occurs.
    Type: Grant
    Filed: May 21, 1992
    Date of Patent: January 11, 1994
    Inventors: Joseph L. Shmidt, Huk Y. Cheh
  • Electrophoresis method and apparatus
    Patent number: 5131994
    Abstract: The present invention relates to a method and apparatus for effecting an electrophoretic separation of charged particles. A fractionation chamber comprising a semipermeable membrane is used wherein a transmembrane force holds the particles to be separated against the membrane surface while a voltage gradient is applied to separate the particles.
    Type: Grant
    Filed: December 17, 1990
    Date of Patent: July 21, 1992
    Inventors: Joseph L. Shmidt, Huk Y. Cheh
  • Free flow electrophoresis method
    Patent number: 5122246
    Abstract: The present invention relates to a free flow electrophoresis method between two ion permeable membranes comprising applying an electric field perpendicular to the primary carrier flow, applying a secondary carrier flow perpendicular to both the primary buffer flow and the electric field, simultaneously reversing the direction of the field and secondary carrier flow, and repeating the previous step until effective separation occurs.
    Type: Grant
    Filed: June 26, 1991
    Date of Patent: June 16, 1992
    Inventors: Joseph L. Schmidt, Huk Y. Cheh
  • Method of hydrophilic coating of plastics
    Patent number: 5023114
    Abstract: Plastics, particularly a method of hydrophilic coating of plastics, for example, a contact lens, with a lubricating and visually acute mucopolysaccharide film which is immobilized upon the surface of the plastic for the lifetime of the plastic. A preferred method includes first coating the plastic with an aqueous solution of a mucopolysaccharide, drying by applying a water-miscible solvent, then crosslinking and permanently immobilizing the first coating upon the plastic by applying a solution of catalyzed organic soluble aliphatic polyisocyanate.
    Type: Grant
    Filed: May 2, 1990
    Date of Patent: June 11, 1991
    Inventors: Gregory Halpern, Charles Campbell, Ellington M. Beavers, Huk Y. Cheh
  • Method of hydrophilic coating of plastics
    Patent number: 4801475
    Abstract: Plastics, particularly a method hydrophilic coating of plastics, for example, a contact lens, with a lubricating and visually acute mucopolysaccharide film which is immobilized upon the surface of the plastic for the lifetime of the plastic. A preferred method includes first coating the plastic with an aqueous solution of a mucopolysaccharide, drying by applying a water-miscible solvent, then crosslinking and permanently immobilizing the first coating upon the plastic by applying a solution of catalyzed organic soluble aliphatic polyisocyanate.
    Type: Grant
    Filed: August 23, 1984
    Date of Patent: January 31, 1989
    Inventors: Gregory Halpern, Charles Campbell, Ellington M. Beavers, Huk Y. Cheh