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Class Information
Number: 137/400
Name: Fluid handling > Liquid level responsive or maintaining systems > With supplemental or safety closing means or bias
Description: Apparatus which (1) includes the application of a supplemental force or bias that will insure the closing of the valve controlled by the liquid level responsive means, or (2) is combined with means to insure that the flow is stopped, in case the valve fails to close properly when urged in closing position by the liquid level sensing means.










Sub-classes under this class:

Class Number Class Name Patents
137/402 Gravitating tank 0
137/401 Sinking or bucket type float 2


Patents under this class:

Patent Number Title Of Patent Date Issued
8596293 Water appliance having a flow control unit and a filter assembly Dec. 3, 2013
8534313 Toilet fill valve auxiliary shutoff mechanism Sep. 17, 2013
8387652 Water saver fill valve and assembly Mar. 5, 2013
8365761 Regulator unit and method for regulating a flap opening of a flap situated in a mass flow line Feb. 5, 2013
8166996 Toilet bowl overflow prevention and water conservation system and method May. 1, 2012
7757708 Toilet bowl overflow prevention and water conservation system and method Jul. 20, 2010
7509973 System to prevent excess fluid flow with a secondary resetting shut-off valve assembly Mar. 31, 2009
6961966 Toilet overflow prevention device Nov. 8, 2005
5986597 Fluid transfer controller with digital bitstream monitor Nov. 16, 1999
5878775 Toilet valve assembly Mar. 9, 1999
5785100 Liquid level detection system Jul. 28, 1998
5440765 Revised automatic water shut off for stuck open flush valves in toilet water tanks Aug. 15, 1995
5421038 Refilling preventing system for a toilet tank Jun. 6, 1995
5408705 Toilet water reservoir valve utilizing float and hydraulic activators Apr. 25, 1995
5398722 Automatic control valve and method Mar. 21, 1995
5282280 Toilet water reservoir inlet and outlet control valve Feb. 1, 1994
5095937 Two stage automatic shut off valve Mar. 17, 1992
5010915 Two stage automatic shut off valve Apr. 30, 1991
4993086 Emergency shut-off mechanism for flush tank Feb. 19, 1991
4901377 Toilet bowl automatic flow shut off and water saver device Feb. 20, 1990
4852053 Material and energy balance reconciliation Jul. 25, 1989
4830040 Automatic swimming pool cover drainer May. 16, 1989
4706310 Liquid level control system Nov. 17, 1987
4592098 Liquid level control system Jun. 3, 1986











 
 
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