Patents by Inventor Duy T. Nguyen

Duy T. Nguyen 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).

  • Polybutene based foam control compositions for aqueous systems
    Patent number: 5229033
    Abstract: A composition to control foam in aqueous systems such as those found in papermaking operations comprising a polybutene and at least one surfactant having a melting or pour point below 20.degree. C. The surfactants include polyethylene glycol esters, sorbitan ester, polyoxyalkylene ester, oleic diethanolamide and block copolymers of ethylene oxide and propylene oxide. Due to their low melting point, these surfactants may be blended with the polybutene at room temperature resulting in a foam control composition that is translucent, resistant to deposition and highly effective.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: July 20, 1993
    Assignee: Betz PaperChem, Inc.
    Inventors: Duy T. Nguyen, Mitzi K. Fader, William A. Hendriks