Patents by Inventor Zeng Xiangwu

Zeng Xiangwu 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).

  • Measurement of base and subgrade layer stiffness using bender element technique
    Patent number: 7082831
    Abstract: The present invention relates to a device and method for measuring the stiffness of base and subgrade layers of soil. The device is a penetrometer comprising first and second spaced apart cone penetrometer shafts. A first of the cone penetrometer shafts is fitted with a set of at least two vertically spaced apart piezoelectric transmitters for wave transmission. The second cone penetrometer shaft is fitted with a set of at least two vertically spaced apart piezoelectric receivers for wave receiving. A trigger device is provided for triggering shear and primary waves from each piezoelectric transmitter to propagate through the soil. A capture device is provided for capturing the shear and primary waves from each of the piezoelectric receivers. A calculating device is provided for calculating soil stiffness from the measured shear and primary wave velocities.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: August 1, 2006
    Inventors: Zeng Xiangwu, Figueroa J. Ludwig
  • Measurement of base and subgrade layer stiffness using bender element technique
    Publication number: 20040226380
    Abstract: The present invention relates to a device and method for measuring the stiffness of base and subgrade layers of soil. The device is a penetrometer comprising first and second spaced apart cone penetrometer shafts. A first of the cone penetrometer shafts is fitted with a set of at least two vertically spaced apart piezoelectric transmitters for wave transmission. The second cone penetrometer shaft is fitted with a set of at least two vertically spaced apart piezoelectric receivers for wave receiving. Trigger means are provided for triggering shear and primary waves from each piezoelectric transmitter to propagate through the soil. Capture means are provided for capturing the shear and primary waves from each of the piezoelectric receivers. Calculating means are provided for calculating soil stiffness from the measured shear and primary wave velocities.
    Type: Application
    Filed: May 13, 2004
    Publication date: November 18, 2004
    Inventors: Zeng Xiangwu, Figueroa J. Ludwig