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Class Information
Number: 418/206.4
Name: Rotary expansible chamber devices > Interengaging rotating members > Like rotary members > Having each radial protuberance of like dimension > Having specific inlet or outlet port shape
Description: Apparatus in which the entrance or exit to a chamber has a particular configuration.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8608465 Positive-displacement rotary pump having a positive-displacement auxiliary pumping system Dec. 17, 2013
8512018 Gear pump with pressure relief groove Aug. 20, 2013
8500425 Roots pumps Aug. 6, 2013
8496303 Pump assembly Jul. 30, 2013
8419399 Roots type gear compressor with helical lobes having communication with discharge port Apr. 16, 2013
8096288 High efficiency supercharger outlet Jan. 17, 2012
8096797 Roots type gear compressor with helical lobes having feedback cavity Jan. 17, 2012
7997885 Roots-type blower reduced acoustic signature method and apparatus Aug. 16, 2011
7963186 Ancillary oil pumping for gear box assembly Jun. 21, 2011
7950911 Single stage root type-vacuum pump and vacuum fluid transport system employing the single stage root type-vacuum pump May. 31, 2011
7845921 Supercharger with outlet bars for rotor tip seal support Dec. 7, 2010
7779822 Intake assembly with integral resonators Aug. 24, 2010
7766635 Rotary pump having sinusoidal sealing lines Aug. 3, 2010
7765993 Compressor inlet duct Aug. 3, 2010
7654806 External toothed wheel pump comprising a relieving pocket Feb. 2, 2010
7479000 Gear pump Jan. 20, 2009
7226280 Roots vacuum pump Jun. 5, 2007
7150612 Gear pump or motor Dec. 19, 2006
7094042 Dual-inlet gear pump with unequal flow capability Aug. 22, 2006
7052259 Vacuum exhausting apparatus May. 30, 2006
6991442 Gear pump and method of making same Jan. 31, 2006
6979185 Bi-rotational pump/hydraulic actuator Dec. 27, 2005
6884050 Roots supercharger with extended length helical rotors Apr. 26, 2005
6758661 Inlet forward supercharger Jul. 6, 2004
6729863 Rotary pump having high and low pressure ports in the housing cover May. 4, 2004
6719542 Pump for printing press Apr. 13, 2004
6705847 Rotary displacement machine having at least two annular displacement gears and supply channels Mar. 16, 2004
6705842 Dynamic attenuator of discharge noise from rotary vacuum machines Mar. 16, 2004
6589034 Backflow orifice for controlling noise generated by a rotary compressor Jul. 8, 2003
6506029 Gear pump Jan. 14, 2003
6439865 Vacuum pump Aug. 27, 2002
6312241 Gear pump Nov. 6, 2001
6312240 Reflux gas compressor Nov. 6, 2001
6283734 Gear pump and a method for positioning a gear pump shaft Sep. 4, 2001
6210139 High efficiency gear pump for pumping highly viscous fluids Apr. 3, 2001
6210138 Rotary pump apparatus and method Apr. 3, 2001
6206668 Fluid machine Mar. 27, 2001
6203297 Fluid flow device with improved cooling system and method for cooling a vacuum pump Mar. 20, 2001
6183229 Hydraulic apparatus Feb. 6, 2001
6176693 Volumetric blower with covers having a duct for connection to the delivery manifold Jan. 23, 2001
6171089 External gear pump with drive gear seal Jan. 9, 2001
6138646 Rotary fluid mover Oct. 31, 2000
6099277 Gas blower and method utilizing recirculation openings Aug. 8, 2000
6095781 Timed element, high pressure, industrial rotary lobe pump Aug. 1, 2000
6062827 Rotary pump May. 16, 2000
6033197 Gear pump having a bleed slot configuration Mar. 7, 2000
5970791 Rotary meter having flow conditioning chambers for pressure pulse reduction Oct. 26, 1999
5845617 Rotary gear pump with vanes Dec. 8, 1998
5772417 Gear pump for conveying viscous fluid media and method of making same Jun. 30, 1998
5730250 Gear type grease pump Mar. 24, 1998

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