Patents by Inventor Wenyuan Xu

Wenyuan Xu 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).

  • Low cost thickness measurement method and apparatus for thin coatings
    Patent number: 6252237
    Abstract: A method and apparatus for measuring the thickness of a coating on a coated surface. The method uses a solid state array of light-sensitive elements to measure light emitted from a fluorescing coating composition. The intensity of the emitted light corresponds to the thickness of the coating composition, and provides a fast and accurate measure of coating thickness.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: June 26, 2001
    Assignee: 3M Innovation Properties Company
    Inventors: John A. Ramthun, Steven P. Floeder, Arthur T. Manning, Lanny L. Harklau, Gregory D. Kostuch, Jack W. Lai, Wenyuan Xu
  • Chemically foamed emulsion explosive composition and process for its preparation
    Patent number: 4992118
    Abstract: A water in oil emulsion explosive composition containing inorganic nitrate and the process for its preparation are disclosed. The composition is an explosive mixture which consists of an aqueous inorganic oxidizer salt solution as disperse phase, residual oil and additives as continuous phase, emulsion foamer as occluded bubble producing material, and span-80 as emulsifier. By adjusting the pH of disperse phase and emulsion foamer, the foaming process at elevated temperature is achieved. it is an industrial explosive and has lower production cost, excellent stability, good moisture resistance and low toxicity, and has a storage life longer than 10 months.
    Type: Grant
    Filed: March 2, 1990
    Date of Patent: February 12, 1991
    Assignee: Gansu Research Institution of Chemical Industry
    Inventors: Zhonji Peng, Guibao Li, Shiyi Shao, Wenyuan Xu, Xiangqun Wu