Patents by Inventor Frank J. O'Brien

Frank J. O'Brien 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).

  • Remote temperature change warning system
    Patent number: 4024495
    Abstract: A remote temperature change warning system for a refrigeration vehicle comprised of a temperature sensing circuit located in the refrigeration compartment of the refrigeration vehicle and a detection circuit located on the vehicle remote from the temperature sensing circuit and having means for indicating to the vehicle operator the temperature condition in the refrigeration compartment, the output of the temperature sensing circuit and the input of the remote detection circuit being electrically connected through the existing electrical wiring of said refrigeration vehicle.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: May 17, 1977
    Inventor: Frank J. O'Brien