Patents by Inventor John (Ji-Hsiung) Tsai

John (Ji-Hsiung) Tsai 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).

  • Cationic polysaccharides and reagents for their preparation
    Patent number: 6193843
    Abstract: Cationic polysaccharide derivatives are prepared by reacting a polysaccharide with a polycationic reagent having one polysaccharide reactive group and at least two cationic groups. Suitable reagents include polycationic alkyl, aryl, alkaryl, cycloaliphatic, or heterocyclic amines, some of which are novel compositions. The polycationic polysaccharide derivatives prepared from these reagents are useful in the manufacture of paper.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: February 27, 2001
    Assignee: National Starch and Chemical Investment Holding Corporation
    Inventors: John (Ji-Hsiung) Tsai, Peter T. Trzasko, Michael T. Philbin, Robert L. Billmers, Martin M. Tessler, Joseph A. Van Gompel, Morton W. Rutenberg
  • Inverse emulsions
    Patent number: 4690996
    Abstract: Polysaccharide graft copolymers are prepared by a water-in-oil emulsion polymerization process in which the polysaccharide and water-soluble monomer are emulsified in an oil phase containing emulsifying agents and polymerized therein. The resultant emulsion polymers are in stable form and may be used directly, for example, as adhesives for prepasted wallpaper, or may be inverted into aqueous systems and used for their thickening or flocculating properties.
    Type: Grant
    Filed: August 28, 1985
    Date of Patent: September 1, 1987
    Assignee: National Starch and Chemical Corporation
    Inventors: Yen-Jer Shih, John (Ji-Hsiung) Tsai, Wen B. Chiao, Dilip K. Ray-Chaudhuri