Patents by Inventor Chiew-Wah Koay

Chiew-Wah Koay 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).

  • Zwitterion polymer for water borne coatings
    Patent number: 4308188
    Abstract: A water-dilutable polymer for use in water-borne coatings comprising the half ester zwitterion reaction product of a polymer containing cyclic acid anhydride groups with an alkanolamine of the formula ##STR1## where R is hydrogen or hydroxy, R.sup.1 is hydrogen, hydroxy or methyl and can be the same or different, and R.sup.2 is hydrogen or an aliphatic hydrocarbon group of from 1 to 3 carbon atoms.
    Type: Grant
    Filed: June 2, 1980
    Date of Patent: December 29, 1981
    Assignee: International Minerals & Chemical Corp.
    Inventors: Zeno W. Wicks, Milton E. Woods, Chiew-Wah Koay