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Class Information
Number: 417/429
Name: Pumps > Plural pumps with individual or relative control > Adjustment with respect to common drive
Description: Apparatus in which the pumping units are driven by a single common drive member (e.g., shaft) and the control means is effective to change the relationship of at least one of the pumps with respect to the drive member.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8690553 Service pack tandem pump Apr. 8, 2014
8668465 Hydraulic system with supplement pump Mar. 11, 2014
8579599 System, apparatus, and method for rapid pump displacement configuration Nov. 12, 2013
8517693 Multi-compressor string with multiple variable speed fluid drives Aug. 27, 2013
8506267 Pump assembly Aug. 13, 2013
8231359 Pump unit comprising a main pump and a charge pump with a variable pump capacity Jul. 31, 2012
7942654 Addressable multi-channel peristaltic pump May. 17, 2011
7827961 Fluid pump Nov. 9, 2010
7789638 Pump for providing three modes of pumping Sep. 7, 2010
7544050 Hydraulic proportioning system Jun. 9, 2009
7452193 Adjustable pump assembly with single motor and multiple pumps Nov. 18, 2008
7384183 Mobile decontamination unit Jun. 10, 2008
7275735 Fan drive for fluid cooler with evaporative heat exchanger Oct. 2, 2007
7162948 Variable stroke assembly balancing Jan. 16, 2007
7090475 Hydraulic control circuit for a hydraulic engine with at least two speeds Aug. 15, 2006
6973798 Air conditioning system for vehicle Dec. 13, 2005
6960069 Arrangement structure of swash plate hydraulic pump hydraulic pump Nov. 1, 2005
6913447 Metering pump with varying piston cylinders, and with independently adjustable piston strokes Jul. 5, 2005
6783331 System and method of multiple-phase pumping Aug. 31, 2004
6659726 Variable speed control of multiple motors Dec. 9, 2003
6579067 Variable speed control of multiple compressors Jun. 17, 2003
6454543 Selectively operable multiple pump assembly Sep. 24, 2002
6162023 Reciprocating cam actuation mechanism for a pump Dec. 19, 2000
6109894 Dual piston pump device for feeding two independent liquids Aug. 29, 2000
6022198 Twin pump with a charging pump Feb. 8, 2000
5775881 Oil supply system Jul. 7, 1998
5599177 Precision metered multiple fluid pumping system Feb. 4, 1997
5536151 Device for the pneumatic discharge of concrete that is hydromechanically transported in a dense flow Jul. 16, 1996
5522711 Precision metered multiple fluid pumping system Jun. 4, 1996
5423662 Precision metered multiple fluid pumping system Jun. 13, 1995
5395216 Portable car-used oil extracting and tire inflation apparatus with separately disposed oil and air pumps Mar. 7, 1995
5326232 Two stage pump assembly with mechanical disconnect Jul. 5, 1994
5284249 Direct hydraulic drive for large flotation cells Feb. 8, 1994
5158438 Quick mount pump frame Oct. 27, 1992
5140747 Method for assembling a peristaltic pump Aug. 25, 1992
5108271 Multiple connection for rotation vacuum pumps Apr. 28, 1992
5104300 Liquid additive metering Apr. 14, 1992
5032065 Radial piston pump Jul. 16, 1991
5016440 Apparatus for delivering a controllable variable flow of pressurized fluid May. 21, 1991
4930994 Radial piston pump Jun. 5, 1990
4917580 Pump mechanism for simultaneous delivery of two atomizer liquids to a sprayer device Apr. 17, 1990
4907950 Variable positive fluid displacement system Mar. 13, 1990
4806079 Apparatus for simultaneously pumping a plurality of liquids Feb. 21, 1989
4789310 Multi-function implement for illumination and air-supply Dec. 6, 1988
4750005 Continuous ink jet printer's selectable ink circulation subsystems Jun. 7, 1988
4619592 Pumping system having a main pump and a plurality of selectively operable subsidiary pumps Oct. 28, 1986
4586468 Tandem pump assembly May. 6, 1986
4547128 Proportional mixing means Oct. 15, 1985
4509903 Catalyst slave pump Apr. 9, 1985
4494676 Multi-component delivery apparatus Jan. 22, 1985

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