Patents by Inventor David Richard Lauzon

David Richard Lauzon 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).

  • Process variable transmitter with self-learning loop diagnostics
    Patent number: 10367612
    Abstract: A two-wire process variable transmitter for use in an industrial process includes a process variable sensor configured to sense a process variable of a process fluid of the industrial process. Output circuitry provides an output on a two-wire process control loop which is related to the sensed process variable. Terminal voltage measurement circuitry measures a voltage at terminals of the process variable transmitter. The terminal voltage is a voltage measured across an electrical connection of the two-wire process variable transmitter to the two-wire process control loop. A microprocessor performs loop diagnostics on the two-wire process control loop based upon a loop current and the measured terminal voltage. The microprocessor determines coefficients of a polynomial equation which relates loop current and terminal voltage during normal operation of the two-wire process variable transmitter and performs subsequent diagnostics based upon the coefficients of the polynomial.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: July 30, 2019
    Assignee: ROSEMOUNT INC.
    Inventors: Steven John McCoy, David Richard Lauzon
  • Process variable transmitter with self-learning loop diagnostics
    Patent number: 10320535
    Abstract: A two-wire process variable transmitter for use in an industrial process includes a process variable sensor configured to sense a process variable of a process fluid of the industrial process. Output circuitry provides an output on a two-wire process control loop which is related to the sensed process variable. Terminal voltage measurement circuitry measures a voltage at terminals of the process variable transmitter. The terminal voltage is a voltage measured across an electrical connection of the two-wire process variable transmitter to the two-wire process control loop. A microprocessor performs loop diagnostics on the two-wire process control loop based upon a loop current and the measured terminal voltage. The microprocessor determines coefficients of a polynomial equation which relates loop current and terminal voltage during normal operation of the two-wire process variable transmitter and performs subsequent diagnostics based upon the coefficients of the polynomial.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: June 11, 2019
    Assignee: ROSEMOUNT INC.
    Inventors: Steven John McCoy, David Richard Lauzon
  • PROCESS VARIABLE TRANSMITTER WITH SELF-LEARNING LOOP DIAGNOSTICS
    Publication number: 20170093533
    Abstract: A two-wire process variable transmitter for use in an industrial process includes a process variable sensor configured to sense a process variable of a process fluid of the industrial process. Output circuitry provides an output on a two-wire process control loop which is related to the sensed process variable. Terminal voltage measurement circuitry measures a voltage at terminals of the process variable transmitter. The terminal voltage is a voltage measured across an electrical connection of the two-wire process variable transmitter to the two-wire process control loop. A microprocessor performs loop diagnostics on the two-wire process control loop based upon a loop current and the measured terminal voltage. The microprocessor determines coefficients of a polynomial equation which relates loop current and terminal voltage during normal operation of the two-wire process variable transmitter and performs subsequent diagnostics based upon the coefficients of the polynomial.
    Type: Application
    Filed: September 30, 2015
    Publication date: March 30, 2017
    Inventors: Steven John McCoy, David Richard Lauzon