Patents by Inventor Robert P. Parris

Robert P. Parris 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).

  • Apparatus for controlling temperature of an element having a temperature variable resistance
    Patent number: 5464965
    Abstract: A fast and accurate temperature controller for a device heated by current through a resistive element, such as various air data probes, wherein the resistance of the element varies with temperature. The temperature controller samples the temperature by selecting the resistance value of the resistive element. Analog calculations are performed based on the instantaneous applied voltage and current returned through the resistive element. Current through the resistive element is controlled by comparing the resistance of the element to a resistance value selected in accordance with the temperature characteristics of the element. Insensitivity to voltage and frequency variations is provided with a highly reliable and uncomplicated circuit having a small number of components.
    Type: Grant
    Filed: April 20, 1993
    Date of Patent: November 7, 1995
    Assignee: Honeywell Inc.
    Inventors: John A. McGregor, Robert P. Parris