Patents by Inventor Shafiqul I. Siddiqui

Shafiqul I. Siddiqui 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).

  • Method and apparatus for measuring in-place density and moisture content
    Patent number: 6215317
    Abstract: A method and apparatus for measuring in-place soil density and moisture content. A cylindrical cell is disclosed which may be used to measure the density and the dielectric constant of a soil sample placed within the cylindrical cell. Also disclosed is a multiple rod probe which is designed to contact spikes driven into the ground to measure the in-place dielectric constant of soil. The multiple rod probe includes adjustable studs which ensure complete contact with the spikes. Both measurements are performed using time domain reflectometry. The present invention develops equations for determining the density of the soil in-place from the measured dielectric constant of the soil in-place and the measured density and dielectric constant of the soil in the cylindrical cell.
    Type: Grant
    Filed: April 27, 1999
    Date of Patent: April 10, 2001
    Assignee: Purdue Research Foundation
    Inventors: Shafiqul I. Siddiqui, Vincent P. Drnevich
  • Method and apparatus for measuring in-place soil density and moisture content
    Patent number: 5933015
    Abstract: A method and apparatus for measuring in-place soil density and moisture content. A cylindrical cell is disclosed which may be used to measure the density and the dielectric constant of a soil sample placed within the cylindrical cell. Also disclosed is a multiple rod probe which is designed to contact spikes driven into the ground to measure the in-place dielectric constant of soil. The multiple rod probe includes adjustable studs which ensure complete contact with the spikes. Both measurements are performed using time domain reflectometry. The present invention develops equations for determining the density of the soil in-place from the measured dielectric constant of the soil in-place and the measured density and dielectric constant of the soil in the cylindrical cell.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: August 3, 1999
    Assignee: Purdue Research Foundation
    Inventors: Shafiqul I. Siddiqui, Vincent P. Drnevich
  • Method and apparatus for measuring in-place soil density and moisture content
    Patent number: 5801537
    Abstract: A method and apparatus for measuring in-place soil density and moisture content. A cylindrical cell is disclosed which may be used to measure the density and the dielectric constant of a soil sample placed within the cylindrical cell. Also disclosed is a multiple rod probe which is designed to contact spikes driven into the ground to measure the in-place dielectric constant of soil. The multiple rod probe includes adjustable studs which ensure complete contact with the spikes. Both measurements are performed using time domain reflectometry. The present invention develops equations for determining the density of the soil in-place from the measured dielectric constant of the soil in-place and the measured density and dielectric constant of the soil in the cylindrical cell.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: September 1, 1998
    Assignee: Purdue Research Foundation Office of Technology Transfer
    Inventors: Shafiqul I. Siddiqui, Vincent P. Drnevich