Patents by Inventor Ellen Shirley E. Schwartz

Ellen Shirley E. Schwartz 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).

  • Fluid quality test method based on impedance
    Patent number: 6922064
    Abstract: A system for determining a quality of a fluid includes an impedance cell immersed in the fluid and impedance instrumentation that communicates with the impedance cell. A controller measures a first impedance of the fluid using an electrical signal at a first frequency, measures a second impedance of the fluid using an electrical signal at a second frequency and measures a third impedance of the fluid using an electrical signal at a third frequency. The controller determines a permittivity and a resistivity of the fluid based on the first, second and third impedances. The quality of the fluid is evaluated based on the permittivity and the resistivity.
    Type: Grant
    Filed: June 18, 2003
    Date of Patent: July 26, 2005
    Assignee: General Motors Corporation
    Inventors: Ion C. Halalay, Ellen Shirley E. Schwartz
  • Fluid quality test method based on impedance
    Publication number: 20040257094
    Abstract: A system for determining a quality of a fluid includes an impedance cell immersed in the fluid and impedance instrumentation that communicates with the impedance cell. A controller measures a first impedance of the fluid using an electrical signal at a first frequency, measures a second impedance of the fluid using an electrical signal at a second frequency and measures a third impedance of the fluid using an electrical signal at a third frequency. The controller determines a permittivity and a resistivity of the fluid based on the first, second and third impedances. The quality of the fluid is evaluated based on the permittivity and the resistivity.
    Type: Application
    Filed: June 18, 2003
    Publication date: December 23, 2004
    Inventors: Ion C. Halalay, Ellen Shirley E. Schwartz