Patents by Inventor Qiangxia Liu

Qiangxia Liu 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).

  • Gypsum-containing products containing alpha hemihydrate
    Patent number: 7771851
    Abstract: The invention provides gypsum wallboard, made from gypsum-containing slurries having outstanding hydration rate characteristics comprising alpha-hemihydrate ground to a particular particle size distribution range and having a Blaine surface area in the range from about 3100 cm2/g to about 9000 cm2/g, alone or in combination with beta-hemihydrate.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: August 10, 2010
    Assignee: United States Gypsum Company
    Inventors: Weixin David Song, Qiang Yu, Qiangxia Liu
  • Gypsum-containing products containing alpha hemihydrate
    Publication number: 20070048549
    Abstract: The invention provides gypsum wallboard, made from gypsum-containing slurries having outstanding hydration rate characteristics comprising alpha-hemihydrate ground to a particular particle size distribution range and having a Blaine surface area in the range from about 3100 cm2/g to about 9000 cm2/g, alone or in combination with beta-hemihydrate.
    Type: Application
    Filed: August 26, 2005
    Publication date: March 1, 2007
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventors: Weixin Song, Qiang Yu, Qiangxia Liu