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Class Information
Number: 417/280
Name: Pumps > With condition responsive pumped fluid control > Responsive to pump created drive motor condition
Description: Apparatus in which the pump is provided with a driving motor and the sensing means responds to a condition of the motor or the operating medium of the motor which is generated by a condition or change of condition of the pump.

Patents under this class:

Patent Number Title Of Patent Date Issued
8434315 Compressor driving torque estimating apparatus May. 7, 2013
7859801 Control apparatus for linear compressor Dec. 28, 2010
7762788 Fluid conveyance system and fluid conveyance device Jul. 27, 2010
7481634 Volumetric screw compressor provided with delivery adjustment device Jan. 27, 2009
7275916 Integrated engine/compressor control for gas transmission compressors Oct. 2, 2007
7032375 Secondary air supply system Apr. 25, 2006
7021902 Hybrid compressor Apr. 4, 2006
6986646 Electronic trim for a variable delivery pump in a hydraulic system for an engine Jan. 17, 2006
6918261 Electric compressor with a motor, an electric circuit and a protective control means therefor Jul. 19, 2005
6863502 Variable speed hydraulic pump Mar. 8, 2005
6790018 Reciprocating compressor having an exhaust valve controlled by an electromagnet Sep. 14, 2004
6685440 Methods of pressure fluctuation dampening Feb. 3, 2004
6676382 Sump pump monitoring and control system Jan. 13, 2004
6450771 System and method for controlling rotary screw compressors Sep. 17, 2002
6406273 Pressure fluctuation dampening system Jun. 18, 2002
6357234 Turbocharger system with turbines having independently controlled variable nozzles Mar. 19, 2002
6257838 Gas compressor Jul. 10, 2001
6247903 Pressure fluctuation dampening system Jun. 19, 2001
6244824 System and methods for controlling rotary screw compressors Jun. 12, 2001
6139280 Electric switch gauge for screw compressors Oct. 31, 2000
6077051 System and methods for controlling rotary screw compressors Jun. 20, 2000
5984644 Dual output window washer pump for an automotive vehicle Nov. 16, 1999
5885062 Switching valve fluid compressor and heat pump type refrigeration system Mar. 23, 1999
5520521 Hydraulic control device for a viscous fluid pump May. 28, 1996
5452989 Reverse phase and high discharge temperature protection in a scroll compressor Sep. 26, 1995
4940391 Compressor surge detection system Jul. 10, 1990
4819123 Compressed air supply system Apr. 4, 1989
4809497 Gas turbine engine/load compressor power plants Mar. 7, 1989
4616483 Diffuser wall control Oct. 14, 1986
4519748 Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current May. 28, 1985
4494382 Method and apparatus for controlling when to initiate an increase in compressor capacity Jan. 22, 1985
4487363 Bypass control system to maintain a constant air supply pressure in a HVAC duct system Dec. 11, 1984
4412788 Control system for screw compressor Nov. 1, 1983
4362472 Rotary compressor with variable built-in volume ratio Dec. 7, 1982
4285639 Electronic control for variable displacement pumps Aug. 25, 1981
4249866 Control system for screw compressor Feb. 10, 1981
4141539 Heat treating furnace with load control for fan motor Feb. 27, 1979
4080110 Control system for variable capacity gas compressor Mar. 21, 1978
3995974 Internal combustion assisted hydraulic engine Dec. 7, 1976
3945308 Limiting control arrangement for exhaust system operation Mar. 23, 1976

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