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Class Information
Number: 137/391
Name: Fluid handling > Liquid level responsive or maintaining systems > Control of both inflow and outflow of tank
Description: Apparatus which includes means responsive to variations of the level of the accumulated liquid to control both the inflow to and outflow from an accumulation of liquid.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8657161 Beverages dispenser and a method for dispensing beverages Feb. 25, 2014
8644993 Method of controlling the flow rate of the liquid by controlling operation of the pump Feb. 4, 2014
8430115 Leak detection system for humidifier Apr. 30, 2013
8408234 Process liquid supply system, process liquid supply method, and storage medium Apr. 2, 2013
8402994 Valve assembly Mar. 26, 2013
8398937 Microchannel and analyzing device Mar. 19, 2013
8394241 Distillation-type drinking fountain and energy-saving heating unit thereof Mar. 12, 2013
RE42771 Method of operation of a device for energy conversion using a main fuel and at least one auxiliary fuel Oct. 4, 2011
8025076 Valve assembly Sep. 27, 2011
7972561 Microfluidic device Jul. 5, 2011
7793682 Valve assembly Sep. 14, 2010
7641771 Pressure desalination Jan. 5, 2010
7614412 Washer fluid spraying apparatus Nov. 10, 2009
7509974 Metallic ball for a ballcock Mar. 31, 2009
7497229 Seal support system with discharging means Mar. 3, 2009
7477059 Method to determine the contents level of a first fluid in a container and to determine a presence of a second fluid below the first fluid and level measurement apparatus to execute said metho Jan. 13, 2009
7189365 Liquid treating equipment including a storage vessel and a discharge vessel Mar. 13, 2007
7082962 Seal support system for maintaining barrier fluid pressure within a mechanical seal Aug. 1, 2006
7028700 Method and apparatus for level control in a water tank of a fuel reformer Apr. 18, 2006
6938635 Level switch with verification capability Sep. 6, 2005
6932097 Acoustic control of the composition and/or volume of fluid in a reservoir Aug. 23, 2005
6874929 Apparatus and method for supplying chemicals Apr. 5, 2005
6845782 Multiple tank circulating fuel system Jan. 25, 2005
6766614 Automatic liquid dispensing device with smart properties Jul. 27, 2004
6675398 Diverter for use with tank valves to direct flow to tank or rim Jan. 13, 2004
6644344 Method and apparatus for metering a flow rate of a fluid Nov. 11, 2003
6598617 Cascaded variable bias feedforward and feedback flow and level control system Jul. 29, 2003
6582563 Water purification system Jun. 24, 2003
6546944 Fluid siphon outlet sensor system Apr. 15, 2003
6532984 Constant flow liquid supplier Mar. 18, 2003
6502607 Fuel tank valve apparatus Jan. 7, 2003
6422263 Nested and cascaded variable bias feedfoward and feedback flow and level control system Jul. 23, 2002
6303024 Three batch fill/settle/draw electronic controller for use with a reverse osmosis unit Oct. 16, 2001
6257287 Fuel fill pipe shut-off device Jul. 10, 2001
6253781 Process for controlling the level of an ammonium fluoride-containing acid solution in an acid vessel Jul. 3, 2001
6209570 Automatic flush valve Apr. 3, 2001
6202677 Multi-functional cleaning and filtering system for aquarium tank Mar. 20, 2001
6185760 Liquid flow control tap with inexhaustible energy-operated valve Feb. 13, 2001
6148852 Sump pit regulating valve Nov. 21, 2000
6148838 Automated processing liquid drain system Nov. 21, 2000
6129110 Fluid level management system Oct. 10, 2000
6092547 Double funnel float valve Jul. 25, 2000
6062253 Apparatus for the intermediate storage and controllable release of a predeterminable quantity of water May. 16, 2000
6012481 Constant-level fluid supplier Jan. 11, 2000
6000425 Automatic remote fluid level controller Dec. 14, 1999
5941417 Fill system equipped with apparatus for continuous controlled inflow to a balance tank Aug. 24, 1999
5920920 Straight trap toilet apparatus Jul. 13, 1999
5857624 Windshield washer nozzle with drain port Jan. 12, 1999
5771178 Fail-safe fluid transfer controller Jun. 23, 1998
5726404 Valveless liquid microswitch Mar. 10, 1998

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