Patents by Inventor Hoc Nghia Tran

Hoc Nghia Tran 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).

  • Process of producing sodium hydroxide from sodium sulphate in a pulp mill
    Patent number: 5702570
    Abstract: Sodium hydroxide is formed from sodium sulphate by a three step operation comprising converting the sodium sulphate to sodium sulphide, converting the sodium sulphide to sodium bicarbonate, and converting the sodium bicarbonate to sodium hydroxide. The operations preferably are effected in conjunction with a bleached kraft pulp mill operation, so as to utilize by-product sodium sulphate from chlorine dioxide generation to produce useful sodium hydroxide as sulphur without co-producing chlorine.
    Type: Grant
    Filed: July 12, 1994
    Date of Patent: December 30, 1997
    Assignee: Thor Technology Corporation
    Inventors: James W. Smith, Hoc Nghia Tran