Patents by Inventor Phillip R. Crabbs

Phillip R. Crabbs 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).

  • Heat pump output indicator
    Patent number: 4217761
    Abstract: A device for measuring the relative efficiency of a heat pump whose design efficiency increases in proportion to the outdoor temperature. Temperature sensitive diodes connected to a differential amplifier are inserted in the return air stream and supply air stream of a heat pump in order to measure the air temperature increase across the indoor coil. A third temperature sensitive diode connected to a second differential amplifier is placed outdoors in order to measure the outdoor temperature. The outputs of the first two differential amplifiers are combined and then subtracted from a fixed value signal by a third amplifier in order to produce an output which is proportional to the relative efficiency of the heat pump at the outdoor temperature.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: August 19, 1980
    Inventors: James L. Cornaire, Phillip R. Crabbs