1
Guy Kevin Spicer: Nested and cascaded variable bias feedfoward and feedback flow and level control system. Guy K Spicer, July 23, 2002: US06422263 (43 worldwide citation)

A control system for maintaining the liquid levels in a plurality of reservoirs connected in series includes a parenthetical control module and one or more nested control modules. The parenthetical control module includes a proportional only level controller in electrical communication with the leve ...


2
Robert B Pepper deceased, by Jayme P Ginsburg executor: Ultrasonically operated water faucet. Allston L Jones, September 26, 1989: US04869287 (42 worldwide citation)

A water faucet is disclosed that is automatically turned on and off in response to the proximity of the user's hand or other object to the faucet. An ultrasonic transducer is located in the faucet near the water outlet and transmits bursts of ultrasonic waves. When a wave reflects off a user's hand ...


3
Mark W Fuller: Liquid level controller. B Deon Criddle, January 8, 1980: US04182363 (36 worldwide citation)

A durable, long lasting liquid level controller utilizing an encapsulated, low current, solid state circuit, projecting metal probes arranged to minimize erroneous readings due to liquid adhering to the probes and a wave discriminating means as part of the encapsulated solid state circuitry, said wa ...


4
Daniel E Cook, Edward D Lewis: Device for the remote control of pneumatically operated mechanisms, which has fast, high resolution response over a broad range of pressures and which is insensitive to position or vibration. Woodard Emhardt Naughton Moriarty & McNett, February 20, 1990: US04901758 (25 worldwide citation)

An electropneumatic transducer which operates quickly and accurately over a broad range of pressures to control high pressure, high flow devices at their point of operation. The transducer is lightweight and insensitive to position or vibration, and can be readily mounted to the device to be control ...


5
Mario DePirro: Pneumatic valve. Basil E Demeur, Alan B Samlan, Robert E Knechtel, November 29, 1983: US04417598 (23 worldwide citation)

A pneumatic valve system for sealing off the flow of a liquid at the intersection of two pipes, one of the pipes being vertically disposed with respect to the other pipe. A sensing probe senses liquid at a pre-established height in the vertically disposed height which signals a control system to act ...


6
Robert W Stiles, Lars Hoffmann Berthelsen, Ronald B Robol, Christopher R Yahnker, Everett Cox, Donald Steen, Kevin Murphy, Walter J Woodcock Jr, Daniel J Hruby, Peter Westermann Rasmussen, Gert Kjaer, Einar Kjartan Runarsson, Arne Fink Hansen, Alberto Morando, Florin Lungeanu, Nils Ole Harvest: Control algorithm of variable speed pumping system. Pentair Water Pool and, Quartes & Brady, September 13, 2011: US08019479 (21 worldwide citation)

A pumping system includes a pump for moving water. In one aspect, this is in connection with performance of an operation. The system includes a variable speed motor operatively connected to drive the pump. A value indicative of flow rate of water is determined and the motor is controlled to adjust t ...


7
Richard Saatkamp: Method and apparatus for regulating the level of a mixture of flowable material in a container. Windmoller & Holscher, Fleit Jacobson Cohn Price Holman & Stern, July 7, 1992: US05127450 (21 worldwide citation)

A method of regulation of the charging of the feed hopper of an extruder with plastic granules, where it is necessary to supply the material in an amount such that the average level in the container or hopper remains constant with the least possible fluctuation despite the continual, and as a rule, ...


8
Robert S John: Electronic liquid level control apparatus. International Telephone and Telegraph Corporation, James B Raden, Marvin M Chaban, June 28, 1983: US04390793 (21 worldwide citation)

Liquid level control system in which there is a basic resistive level sensing electrode or probe extending into a vessel or tank containing liquid. In addition there is a conductive guard ring or shield insulated from both the probe and from the conductive member or portion of the body of the vessel ...


9
B Edward Ramey, Mario Moreno: Liquid level sensing probe and control circuit. Akzo, Gregory R Muir, William M Blackstone, February 27, 1996: US05493922 (19 worldwide citation)

A method and apparatus for a liquid level sensor control circuit of a bioassay apparatus for controlling a position of a sampling probe with respect to a surface of a liquid in a container. The apparatus includes a sampling probe, an oscillator circuit coupled to the sampling probe for producing a f ...


10
Albert L Izaguirre: Method, system, and apparatus for operating large power generating stations with improved environmental protection measures. Frank J Dykas, Craig M Korfanta, Ken J Pederson, April 26, 1994: US05305779 (18 worldwide citation)

A system for containing oil in a containment tank received from a transformer bank for a hydroelectric power generating station. A capacitance proximity sensor is mounted at a predetermined height within the tank and is operative to sense the passage of an oil/water interface in close proximity to t ...