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Class Information
Number: 137/398
Name: Fluid handling > Liquid level responsive or maintaining systems > Control of outflow from tank > By float
Description: Apparatus which includes one or more floats responsive to a change in the level of the accumulated liquid.










Sub-classes under this class:

Class Number Class Name Patents
137/399 Low level safety cut-off 54


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8701701 Float switch of a humidifier Apr. 22, 2014
8596293 Water appliance having a flow control unit and a filter assembly Dec. 3, 2013
8499785 Overflow valve for prevention of water vapor loss Aug. 6, 2013
8316695 Line leak detector and method of using same Nov. 27, 2012
8291929 Dual float rollover valve Oct. 23, 2012
8186376 Liquid purge valve May. 29, 2012
8065759 McClain's bathtub monitor Nov. 29, 2011
7895849 Dehumidifier with multistage draining Mar. 1, 2011
7642455 Transformer conservator isolation valve (TCIV) Jan. 5, 2010
7523761 Device for controlling fluid flow from a tank Apr. 28, 2009
7412988 Pneumatic level control Aug. 19, 2008
7296590 Liquid suction device Nov. 20, 2007
6886588 Buoyancy flushing apparatus and method thereof May. 3, 2005
6845782 Multiple tank circulating fuel system Jan. 25, 2005
6814266 Device for the distribution of water into vases or similar Nov. 9, 2004
6808370 Gas pressure driven tank fluid pump having float and snap-acting rotary valve Oct. 26, 2004
6640828 Flushing apparatus and method thereof Nov. 4, 2003
6474361 Floating weir assembly and fluid flow management system comprising same Nov. 5, 2002
6453939 Flotation cell fluid level control apparatus Sep. 24, 2002
6328882 Residential waste water recycling system Dec. 11, 2001
6277287 Self leveling suction skimming device Aug. 21, 2001
6257287 Fuel fill pipe shut-off device Jul. 10, 2001
6240954 Balance float controlled valve assembly Jun. 5, 2001
6159362 Skimmer valve Dec. 12, 2000
6129836 Two-chamber fluid control valve and water softener incorporating same Oct. 10, 2000
6112763 Valves Sep. 5, 2000
6012481 Constant-level fluid supplier Jan. 11, 2000
6012477 Circulating drainage system for sewage pipe installation work Jan. 11, 2000
5894858 Device for shutting off the feed or discharge pipe of a mobility separator Apr. 20, 1999
5800700 Sludge supernatant decanting device Sep. 1, 1998
5657494 Toilet flushing device Aug. 19, 1997
5618410 Automatically draining vacuum apparatus Apr. 8, 1997
5610591 Liquid level alarm system Mar. 11, 1997
5582601 Cassette for receiving aspirated fluids Dec. 10, 1996
5419359 Gas and liquid backflow-preventing valve device for drains May. 30, 1995
5358644 Method and apparatus for decanting liquid Oct. 25, 1994
5352356 Stovepipe decanter apparatus Oct. 4, 1994
5290434 Effluent dosing septic system Mar. 1, 1994
5234580 Decanting apparatus with float supported submerged pump Aug. 10, 1993
5113889 Floating intake for transport of liquid from a fixed depth below the surface of a reservoir May. 19, 1992
4948010 Waste liquid collection and disposal apparatus Aug. 14, 1990
4936389 Fluid dispenser for an aircraft Jun. 26, 1990
4831990 In-tank fuel reservoir with reservoir fuel level control May. 23, 1989
4825228 Method of, and apparatus for, regulating ink viscosity in an ink jet printing system Apr. 25, 1989
4709427 Disabler system for plumbing fixture Dec. 1, 1987
4704140 Procedure and means for use in pumping and volumetry of foodstuff liquids Nov. 3, 1987
4702271 Flow-control device Oct. 27, 1987
4620441 Liquid level control Nov. 4, 1986
4617802 Freezer apparatus Oct. 21, 1986
4589442 Valve for suction installation May. 20, 1986

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