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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 6305404 |
Device for regulating the contents of a container |
Oct. 23, 2001 |
| 6305406 |
Spray hood protector in a fluid-based cooling system |
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 |
| 6192321 |
Method of and apparatus for deterministically obtaining measurements |
Feb. 20, 2001 |
| 6178569 |
Toilet overflow control |
Jan. 30, 2001 |
| 6148838 |
Automated processing liquid drain system |
Nov. 21, 2000 |
| 6135133 |
Water-heater containment and warning device |
Oct. 24, 2000 |
| 6125870 |
Overflow protection for a washing machine |
Oct. 3, 2000 |
| 6095178 |
System for monitoring and controlling the level of a liquid in a closed container |
Aug. 1, 2000 |
| 6082392 |
Dual hose assembly and control system for truck-to-truck fuel transfer |
Jul. 4, 2000 |
| 6058519 |
Toilet overflow control |
May. 9, 2000 |
| 6058986 |
Beverage dispensing control |
May. 9, 2000 |
| 6049940 |
Control circuit for a liquid collecting device |
Apr. 18, 2000 |
| 6024116 |
Valve assembly and acuator operative for automatically shutting off water and gas supplies to a hot water heater upon detection of a water leak |
Feb. 15, 2000 |
| 6003536 |
Automatic water shut-off valve |
Dec. 21, 1999 |
| 5992447 |
Device for filling vinyl lined pools |
Nov. 30, 1999 |
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