1
Charles R Willcox: Pressure sensor diagnostics in a process transmitter. Rosemount, Westman Champlin & Kelly P A, September 9, 1997: US05665899 (91 worldwide citation)

A transmitter in a process control system includes diagnostic circuitry for determining condition of a pressure sensor. The pressure sensor includes a pressure responsive structure and a capacitor coupled to the pressure responsive structure whereby capacitance of the capacitor varies in response to ...


2
Roger L Frick, Charles R Willcox: Optical switch with moveable holographic optical element. Rosemount, Marshall Gerstein & Borun, February 21, 2006: US07003187 (40 worldwide citation)

An optical switch formed of a holographic optical element (HOE) disposed above a top surface of a substrate and moveable relative thereto is shown. Light is traveling through the substrate under total internal reflection, which creates an evanescent field extending beyond the reflecting surfaces of ...


3
Robert J Karschnia, Charles R Willcox, David A Broden, Brian L Westfield, Kelly M Orth: Process field device with radio frequency communication. Rosemount, Westman Champlin & Kelly P A, August 28, 2007: US07262693 (39 worldwide citation)

A field device for use in an industrial process control or monitoring system includes terminals configured to connect to a two-wire process control loop. The loop carries data and provides power to the field device. RF circuitry in the field device is provided for radio frequency communication. A po ...


4
Paul A Ice, Charles R Willcox: Total air temperature probe providing improved anti-icing performance and reduced deicing heater error. Rosemount Aerospace, Westman Champlin & Kelly P A, August 26, 2003: US06609825 (34 worldwide citation)

A total air temperature probe positionable on a surface of an aircraft for measuring total air temperature includes an inlet scoop which receives airflow from free stream airflow moving toward the inlet scoop from a first direction. A first portion of the airflow entering the inlet scoop exits the p ...


5
Charles R Willcox, Mark A Lutz, Mark G Romo, Stanley E Rud Jr: Oil-less differential pressure sensor. Rosemount, Westman Champlin & Kelly, July 30, 2002: US06425290 (29 worldwide citation)

A pressure sensor is provided for measuring a pressure difference between two fluids which does not require isolation fluid. The pressure sensor includes a diaphragm support member having an outer periphery and diaphragms coupled thereto. Movement of the diaphragms are the movement of a moveable mem ...


6
Charles R Willcox, Kevin R Ley, Eric P Petersen, Larry A Peitersen: Capacitive pressure sensor and reference with stress isolating pedestal. Rosemount, Westman Champlin & Kelly, May 14, 1996: US05515732 (28 worldwide citation)

A pedestal mount capacitive pressure sensor (10) is supported in a housing (11) and used to sense fluid pressures to provide air pressure data relating to the performance of air vehicles. The capacitive sensor uses a thick base plate (40) on which a diaphragm (48) is mounted. A capacitive electrode ...


7
Roger L Frick, Charles R Willcox: Capacitive pressure sensing with moving dielectric. Rosemount, Wetman Champlin & Kelly P A, January 14, 2003: US06505516 (18 worldwide citation)

A pressure sensor with a diaphragm that has a dielectric portion that moves in a cavity near capacitor plates that are fixed relative to a mounting frame. The diaphragm is supported on the frame and the frame surrounds the cavity. The diaphragm has an outer surface that receives pressure and has an ...


8
Fred C Sittler, Charles R Willcox, Stanley E Rud Jr: Optical pressure sensor. Rosemount, Westman Champlin & Kelly P A, September 2, 2003: US06612174 (17 worldwide citation)

A pressure sensor configured to sense an applied pressure, comprising a diaphragm support structure, a diaphragm coupled to the diaphragm support structure and configured to deflect in response to applied pressure, a moveable member coupled to the diaphragm and configured to move in response to defl ...


9
Charles R Willcox, Larry A Peitersen: Anodic bonding method for making pressure sensor. Rosemount, Westerman Champlin & Kelly P A, December 9, 1997: US05695590 (15 worldwide citation)

A pedestal mount capacitive pressure sensor (10) is supported in a housing (11) and used to sense fluid pressures to provide air pressure data relating to the performance of air vehicles. The capacitive sensor uses a thick base plate (40) on which a diaphragm (48) is mounted. A capacitive electrode ...


10
Paul A Ice, Charles R Willcox: Total air temperature probe providing improved anti-icing performance and reduced deicing heater error. Rosemount Aerospace, Westman Champlin & Kelly P A, January 11, 2005: US06840672 (14 worldwide citation)

A total air temperature (TAT) probe for measuring TAT includes an inlet scoop which receives airflow from free stream airflow moving toward the inlet scoop from a first direction. A first portion of the airflow entering the inlet scoop exits the probe through a main exit channel. A second portion of ...