Patents by Inventor Wenlai Li

Wenlai Li 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).

  • Contactless, transformer-based measurement of the resistivity of materials
    Patent number: 6639401
    Abstract: The present invention provides an apparatus and method for measuring the resistivity of a sample of cement-based material. A transformer is formed with a primary coil, a secondary formed by means of a sample of said cement-based material, means for supplying a voltage to said primary, means for measuring the voltage induced in said sample, and means for measuring the current induced in said sample. The resistance of the sample can be measured and thus the resistivity of the concrete sample can be calculated.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: October 28, 2003
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Zongjin Li, Wenlai Li
  • Apparatus and method for resistivity measurement of concrete
    Publication number: 20030016009
    Abstract: The present invention provides an apparatus and method for measuring the resistivity of a sample of cement-based material. A transformer is formed with a primary coil, a secondary formed by means of a sample of said cement-based material, means for supplying a voltage to said primary, means for measuring the voltage induced in said sample, and means for measuring the current induced in said sample. The resistance of the sample can be measured and thus the resistivity of the concrete sample can be calculated.
    Type: Application
    Filed: July 19, 2001
    Publication date: January 23, 2003
    Inventors: Zongjin Li, Wenlai Li