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Class Information
Number: 210/89
Name: Liquid purification or separation > With alarm, indicator, register, recorder, signal or inspection means > Responsive to fluid flow > Meter-controlled cyclic systems > With time control
Description: Apparatus including means operating during or after a predetermined interval of time.

Patents under this class:

Patent Number Title Of Patent Date Issued
8403152 Fail safe mechanism Mar. 26, 2013
7734379 System, method, and apparatus for managing wastewater treatment installation Jun. 8, 2010
7617939 Faucet mounted water filter Nov. 17, 2009
7453271 Apparatus and method for sensing water within a fuel-water separator assembly Nov. 18, 2008
7037430 System and method for desalination of brackish water from an underground water supply May. 2, 2006
6916424 Method and apparatus for a hemodiafiltration delivery module Jul. 12, 2005
6802961 Dense fluid cleaning centrifugal phase shifting separation process and apparatus Oct. 12, 2004
6773588 Purified water supply system Aug. 10, 2004
6696963 Method and system for anticipating salt depletion Feb. 24, 2004
6423230 Method for improving the permeate flux of a cross-flow membrane filter Jul. 23, 2002
6355177 Water filter cartridge replacement system for a refrigerator Mar. 12, 2002
6120688 Portable reverse osmosis unit for producing drinking water Sep. 19, 2000
6080313 Point-of-use water purification system with a cascade ion exchange option Jun. 27, 2000
6001249 Multi-stage water filter system Dec. 14, 1999
5925240 Water treatment system having dosing control Jul. 20, 1999
5690829 Conditioning process and device for producing pure water Nov. 25, 1997
5544072 Method for regeneration of a water softener Aug. 6, 1996
5540107 Liquid flow meter Jul. 30, 1996
5522998 Hemodialysis apparatus having a single balance chamber and method of dialyzing blood therewith Jun. 4, 1996
5422014 Automatic chemical monitor and control system Jun. 6, 1995
5389254 Water treatment system Feb. 14, 1995
5288398 Filter bed backwashing devices and methods Feb. 22, 1994
5277828 Steam regenerable filter and method Jan. 11, 1994
5215657 Water treatment system Jun. 1, 1993
5173178 Water purifying apparatus with timed discharge after non-use periods Dec. 22, 1992
5152895 Method for cleaning filter elements and filter for implementing it Oct. 6, 1992
5026476 Antivibration cover for rotary machine Jun. 25, 1991
4961845 Apparatus and method for filtering particulate matter from dielectric fluids Oct. 9, 1990
4918426 Method and apparatus for sensing fluid flow volume to indicate end of filter life Apr. 17, 1990
4911832 Automatic drain system treatment apparatus Mar. 27, 1990
4797208 Automatic drain system treatment process Jan. 10, 1989
4771801 Protective cover assembly with reverse buckling disc Sep. 20, 1988
4490249 Microcomputer controlled demand/scheduled water softener Dec. 25, 1984
4470911 Microcomputer controlled demand/scheduled water softener with variable capacity Sep. 11, 1984
4469602 Microcomputer controlled demand/scheduled water softener having automatic resin bed sensing Sep. 4, 1984
4426294 Microcomputer controlled demand/scheduled water softener Jan. 17, 1984
4379057 Method for the cyclic regeneration of water-softening systems and programmed water-softening system for applying the method Apr. 5, 1983
4313825 Control system for meter actuated regeneration in a water treatment system Feb. 2, 1982
4063554 Single needle alternating flow blood pump system Dec. 20, 1977
4032443 Removal of grease and oil from particulate bed granules by backwashing with a detergent Jun. 28, 1977

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