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Class Information
Number: 137/392
Name: Fluid handling > Liquid level responsive or maintaining systems > Electrical characteristic sensing
Description: Apparatus in which the liquid level is sensed by sensing an electrical characteristic of a liquid.










Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8711002 Monitoring of undesirable fluid ingress into subsea control modules Apr. 29, 2014
8469050 Capacitive fluid level sensing Jun. 25, 2013
8446284 Low oil indication May. 21, 2013
8427336 Monitoring of undesirable fluid ingress into subsea control modules Apr. 23, 2013
8241009 Water main system with monitoring of addition of branches, system and method therefor Aug. 14, 2012
8220482 Devices, methods, and algorithms for rapid measurement of mean surface level change of liquids in containers Jul. 17, 2012
8175754 Configuration of a multivariable process fluid flow device May. 8, 2012
8091579 Level sensor Jan. 10, 2012
8065759 McClain's bathtub monitor Nov. 29, 2011
7992527 Water feed controller for a boiler Aug. 9, 2011
7907059 Sewage pipe alarm system and associated method Mar. 15, 2011
7849871 Method and apparatus for controlling a fluid system Dec. 14, 2010
7779858 Valve assembly with overfill protection device and capacitive liquid level gauge Aug. 24, 2010
7509974 Metallic ball for a ballcock Mar. 31, 2009
7487793 Valve assembly with overfill protection device and capacitive liquid level gauge Feb. 10, 2009
7240690 Valve assembly with overfill protection device and capacitive liquid level gauge Jul. 10, 2007
7237409 Steam cleaner with safety device Jul. 3, 2007
7207318 Method for operation of a device for energy conversion using a main fuel and at least one auxiliary fuel Apr. 24, 2007
7171993 Beverage dispenser with automatic cup-filling control Feb. 6, 2007
7161492 Mechanical self-cleaning probe via a jiggler Jan. 9, 2007
7156116 Apparatus and method for operating a valve using a cushion filter Jan. 2, 2007
7093611 Water feeder controller for boiler Aug. 22, 2006
6964278 Non-invasive gauge glass liquid level sensor apparatus Nov. 15, 2005
6935367 Flotation cell fluid level control apparatus Aug. 30, 2005
6926028 Water feeder controller for boiler Aug. 9, 2005
6910498 Liquid level controller Jun. 28, 2005
6877170 Toilet control system Apr. 12, 2005
6868861 Level control system for sheet casting process Mar. 22, 2005
6810902 Automatic water shut off system to prevent overflow of a plumbing device Nov. 2, 2004
6782908 Automotive washer system utilizing a freezable washer liquid and a freeze-resistant washer liquid Aug. 31, 2004
6688329 Water feeder controller for boiler Feb. 10, 2004
6675826 Automatic flood prevention system Jan. 13, 2004
6671894 Toilet overflow control system Jan. 6, 2004
6644343 Electronically controlled beverage dispenser Nov. 11, 2003
6598617 Cascaded variable bias feedforward and feedback flow and level control system Jul. 29, 2003
6584997 Overflow prevention mechanism for liquid transfer systems Jul. 1, 2003
6546944 Fluid siphon outlet sensor system Apr. 15, 2003
6523562 Plumbing flood control system Feb. 25, 2003
6453939 Flotation cell fluid level control apparatus Sep. 24, 2002
6427718 Automated farm turnout Aug. 6, 2002
6397745 Method and apparatus for maintaining ink level in ink fountain of printing press Jun. 4, 2002
6325093 Water distributing installation controllers Dec. 4, 2001
6305406 Spray hood protector in a fluid-based cooling system Oct. 23, 2001
6305404 Device for regulating the contents of a container Oct. 23, 2001
6303024 Three batch fill/settle/draw electronic controller for use with a reverse osmosis unit Oct. 16, 2001
6266964 Use of electronic expansion valve to maintain minimum oil flow Jul. 31, 2001
6263916 Tank system Jul. 24, 2001
6223359 Automatic water level system for swimming pools May. 1, 2001
6223129 Apparatus and method for conductivity measurement including probe contamination compensation Apr. 24, 2001
6206025 Device and method for removing condensate from gas pressure systems Mar. 27, 2001

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