Patents by Inventor John W. McGrew

John W. McGrew 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).

  • Temperature measuring method and apparatus
    Patent number: 4358957
    Abstract: A thermoelectric temperature sensing apparatus in which the thermoelectric reference junction is not maintained at a constant temperature but instead heat is supplied to it or extracted from it at a predetermined, preferably constant, rate by a heater or cooler. The open circuit output voltage of the apparatus is referenced to this predetermined rate of heat supply or extraction to determine the temperature of the other thermoelectric junction. Where the heater or cooler is input responsive, the output voltage of the thermoelectric circuit is referenced to the heater or cooler input.
    Type: Grant
    Filed: September 5, 1980
    Date of Patent: November 16, 1982
    Assignee: Teledyne Isotopes
    Inventors: Victor R. Lougheed, John W. McGrew