1
Benjamin N Lease: Capacitive threshold detector test circuit. Robertshaw Controls Company, Watts Hoffmann Fisher & Heinke, August 29, 1995: US05446444 (19 worldwide citation)

A test circuit for testing operation of a liquid level detector. The liquid level detector includes a probe that is placed at a test site. A control circuit monitors changes in capacitance of the probe due to changes in the liquid level at the test site. A test switch grounds an input to the probe w ...


2
Benjamin N Lease, Lee Paul Dollison: Fluid sensor. Terrence Martin, Sean Detweiler, Jules Jay Morris, January 19, 1999: US05861811 (17 worldwide citation)

A fluid sensor (100) senses a level of fluid (20) in a receptacle (10). The fluid sensor comprises a detector assembly (200) for detecting fluid and comprises sensor circuitry. The detector assembly comprises a detector body (201) comprising an electrically insulative material and defining first and ...


3
Benjamin N Lease: Will call wireless tank level monitoring system. Robertshaw Controls Company, Reinhart Boerner Van Deuren P C, October 28, 2008: US07441569 (15 worldwide citation)

A wireless tank level monitoring system is provided. The system includes a transmitter that is located in close proximity to the storage tank. The transmitter is coupled to a remote-ready tank level gauge, which provides a ratio-metric voltage output proportional to the liquid volume inside the tank ...


4
Benjamin N Lease, Otis P Pierson: Liquid level transmitter. Robertshaw Controls Company, Watts Hoffmann Fisher & Heinke Co A, November 17, 1998: US05838241 (10 worldwide citation)

A level detector circuit for detecting a level of immersion of an elongated probe within a liquid. The level detection circuit includes a first set of transistors. One of these transistors charges an elongated probe and a second charges a capacitor. A reference current source provides a reference cu ...


5
Barry E Martin, Stephen Tymoszuk, Benjamin N Lease: Capacitance level measurement circuit and system. RobertShaw Controls Company, Robert J Hampsch Esq, Richard L Sampson Esq, March 4, 2003: US06529017 (9 worldwide citation)

A capacitance measurement circuit and probe includes a drive circuit couplable to a constant-current source, a threshold detector, a probe capacitor, and a reference capacitor. The circuit includes a plurality of switches being actuatable to alternately couple the current source to the probe capacit ...


6
Benjamin N Lease: Multiple input level sensor. Robert Shaw Controls Company, Richard L Sampson Esq, Robert J Hampsch Esq, June 15, 2004: US06748805 (5 worldwide citation)

A liquid level measuring apparatus is provided, which includes an input circuit configured to receive electrical signals from level sensors configured to provide an electrical signal proportional to a liquid level in a tank portion. The input circuit provides a single output signal proportional to t ...


7
Benjamin N Lease: Will call wireless tank level monitoring system. Robertshaw Controls Company, Reinhart Boerner Van Deuren PC, November 2, 2006: US20060243345-A1

A wireless tank level monitoring system is provided. The system includes a transmitter that is located in close proximity to the storage tank. The transmitter is coupled to a remote-ready tank level gauge, which provides a ratio-metric voltage output proportional to the liquid volume inside the tank ...


8
Barry E Martin, Stephen Tymoszuk, Benjamin N Lease: Capacitance level measurement circuit and system. Richard L Sampson, Sampson & Associates Poc, January 24, 2002: US20020008526-A1

A capacitance measurement circuit and probe includes a drive circuit couplable to a constant-current source, a threshold detector, a probe capacitor, and a reference capacitor. The circuit includes a plurality of switches being actuatable to alternately couple the current source to the probe capacit ...


9
Robert J Alvord, Leonard W Jenski, Benjamin N Lease: System and method for determining defrost power delivered by a defrost heater. Robertshaw Controls Company, Reinhart Boerner Van Deuren PC, October 11, 2007: US20070234748-A1

An adaptive defrost control system of the present invention monitors an amount of current flowing through the defrost heater to calculate the amount of power delivered thereby. The circuit utilizes a thermistor to monitor the temperature rise of the electrical trace supplying current to the defrost ...


10
Benjamin N Lease: Multiple input level sensor. Richard L Sampson, Sampson & Associates PC, July 17, 2003: US20030131662-A1

A liquid level measuring apparatus is provided, which includes an input circuit configured to receive electrical signals from level sensors configured to provide an electrical signal proportional to a liquid level in a tank portion. The input circuit provides a single output signal proportional to t ...