Patents by Inventor John G. Froemel

John G. Froemel 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 sensor
    Patent number: 4011538
    Abstract: A low-cost fluid sensor which has a controlled resistance value is provided by depositing a resistance material between two electrodes on a portion of a molecular sieve layer. A heating resistor for drying out the fluid sensor may also be provided by depositing a resistance strip over another portion of the molecular sieve layer, or alternately by providing the resistance strip adjacent the molecular sieve layer on a supporting substrate.
    Type: Grant
    Filed: January 30, 1976
    Date of Patent: March 8, 1977
    Assignee: Illinois Tool Works Inc.
    Inventor: John G. Froemel