Patents by Inventor Kuo-Chang Tang

Kuo-Chang Tang 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).

  • Liquid colored toner compositions and their use in contact and gap electrostatic transfer processes
    Patent number: 5240806
    Abstract: A liquid colored electrostatic toner comprising:(A) a colored predispersion comprising (1) a non-polymeric resin material having certain insolubility (and nonswellability), melting point, and acid number characteristics; (2) an alkoxylated alcohol having certain insolubility (and nonswellability) and melting point characteristics; and (3) colorant material having certain particle size characteristics; and(B) an aliphatic hydrocarbon liquid carrier having certain conductivity, dielectric constant, and flash point.
    Type: Grant
    Filed: January 3, 1992
    Date of Patent: August 31, 1993
    Assignee: Olin Corporation
    Inventors: Kuo-Chang Tang, Peter E. Materazzi
  • Electrostatographic particulate toner and developer compositions
    Patent number: 5009979
    Abstract: A toner composition comprised of resin particles, colorant material and an effect change controlling amount of at least one charge enhancing additive of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are lower alkyl groups having 1 to 4 carbon atoms; R.sub.3 is a straight-chain alkylene group having from 1 to about 8 carbon atoms; and R.sub.4 is an alkyl group having from about 7 to about 24 carbon atoms.The toners of the present invention are resistant to smearing after fusing onto a suitable substrate, provide good adhesion of the fused image to the substrate, and provide uniform, stable, high net electrical charge on toner particles and work over a wide range of relative humidity.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: April 23, 1991
    Assignee: Olin Hunt Specialty Products Inc.
    Inventors: Galina P. Buxton, Kuo-Chang Tang
  • Process for trimerizing organic polyisocyanates
    Patent number: 4503226
    Abstract: A process for trimerizing organic polyisocyanates using a select catalyst comprising a quaternary ammonium carboxylic acid salt and a carboxylic acid halide or anhydride. The trimerization products are especially suitable for use in the preparation of polyurethane molding compositions.
    Type: Grant
    Filed: April 30, 1984
    Date of Patent: March 5, 1985
    Assignee: Olin Corporation
    Inventors: Kuo-Chang Tang, Phillip T. Berkowitz
  • Polyamine biosynthesis inhibitors
    Patent number: 4376116
    Abstract: A compound having the formula: ##STR1## wherein R is ##STR2## wherein R' is hydrogen or aminopropyl and salts thereof.
    Type: Grant
    Filed: September 1, 1981
    Date of Patent: March 8, 1983
    Assignee: Research Corporation
    Inventors: James K. Coward, Kuo-Chang Tang