Patents by Inventor Sudalaimuthu G. Ganesan

Sudalaimuthu G. Ganesan 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).

  • Patent number: 5159564
    Abstract: A method for determining the thermal history of an object is disclosed. The object carries at least two thermal calibration materials having different activation energies. The method comprises: first, exposing an object to a thermal treatment; second, detecting the change in each of the calibration materials caused by the thermal treatment; and third, determining the thermal history of the thermal treatment from the detected changes.Also disclosed are thermal history recording devices comprising one or more metal insulator semiconductor (MIS) capacitors. The insulating layer is non-uniformly doped with mobile charged carriers. Two or more MIS capacitors, each having different activation energies, may be mounted in a common support structure to provide a thermal memory cell. The thermal cells may be used in conjunction with an apparatus for determining the thermal history of the cells as also dislcosed herein.
    Type: Grant
    Filed: June 3, 1991
    Date of Patent: October 27, 1992
    Assignee: North Carolina State University
    Inventors: Kenneth R. Swartzel, Sudalaimuthu G. Ganesan, Richard T. Kuehn, Raymond W. Hamaker, Farid Sadeghi
  • Patent number: 5021981
    Abstract: A method for determining the thermal history of an object is disclosed. The object carries at least two thermal calibration materials having different activation energies. The method comprises: first, exposing an object to a thermal treatment; second, detecting the change in each of the calibration materials caused by the thermal treatment; and third, determining the thermal history of the thermal treatment from the detected changes.Also disclosed are thermal history recording devices comprising one or more metal insulator semiconductor (MIS) capacitors. The insulating layer is non-uniformly doped with mobile charged carriers. Two or more MIS capacitors, each having different activation energies, may be mounted in a common support structure to provide a thermal memory cell. The thermal cells may be used in conjunction with an apparatus for determining the thermal history of the cells as also disclosed herein.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: June 4, 1991
    Assignee: North Carolina State University
    Inventors: Kenneth R. Swartzel, Sudalaimuthu G. Ganesan, Richard T. Kuehn, Raymond W. Hamaker, Farid Sadeghi