Patents by Inventor Willy K. Chwang

Willy K. Chwang 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).

  • Organotin catalyzed transesterification
    Patent number: 5606103
    Abstract: Methyl or ethyl esters of mono- and polycarboxylic acids are transesterified with alcohols and polyols by reaction in the presence of a catalytically effective amount of organotin catalyst, so that an alcohol or polyol carboxylic acid ester is formed, which is then washed with aqueous alkali having a pH bigger than about 13.2 so as to remove essentially all of the organotin catalyst, thereby permitting the recovery of the alcohol or polyol carboxylic acid ester essentially free of the organotin catalyst.
    Type: Grant
    Filed: December 28, 1995
    Date of Patent: February 25, 1997
    Assignee: CPS Chemical Company, Inc.
    Inventors: Louis E. Trapasso, Philip L. Meisel, Lee B. Meisel, Willy K. Chwang
  • Ethoxylated jojoba oil
    Patent number: 4749517
    Abstract: An Ethoxylated jojoba oil product and a method for making the same.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: June 7, 1988
    Assignee: Alcolac, Inc.
    Inventors: Willy K. Chwang, James F. Stephens, Ronald W. Kreis