Patents by Inventor Ngai Ting Lau

Ngai Ting Lau 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).

  • Catalytic removal of sulfur dioxide form flue gas
    Patent number: 5804153
    Abstract: The present invention discloses a method for the catalytic reduction of sulfur dioxide, for example in flue gas, by carbon monoxide using lanthanum oxysulfide as the active catalyst. The catalyst is prepared from lanthanum oxide by hydration and sulfidization, the latter step being carried out in the gas stream itself. This method of preparation has more general applicability and can also be used as a method for the preparation of lanthanum, yttrium, gadolinium and lutetium oxysulfides generally.
    Type: Grant
    Filed: July 2, 1996
    Date of Patent: September 8, 1998
    Assignee: The Hong Kong University Of Science & Technology
    Inventors: Ming Fang, Jian Xin Ma, Ngai Ting Lau
  • Method for preparing the oxysulfides of rare earth elements
    Patent number: 5795554
    Abstract: The present invention discloses a method for the catalytic reduction of sulfur dioxide, for example in flue gas, by carbon monoxide using lanthanum oxysulfide as the active catalyst. The catalyst is prepared from lanthanum oxide by hydration and sulfidization, the latter step being carried out in the gas stream itself. This method of preparation has more general applicability and can also be used as a method for the preparation of lanthanum, yttrium, gadolinium and lutetium oxysulfides generally.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: August 18, 1998
    Assignee: The Hong Kong University of Science & Technology
    Inventors: Ming Fang, Jian Xin Ma, Ngai Ting Lau