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Class Information
Number: 418/181
Name: Rotary expansible chamber devices > Combined
Description: Apparatus claimed in combination with features other than drive means, valving or support structure and not provided for in preceding subclasses.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8556605 Scroll compressor having a rotation inhibitor Oct. 15, 2013
8550057 Integral rotor noise attenuators Oct. 8, 2013
8535028 Downhole positive displacement motor Sep. 17, 2013
8500423 Frame rotated hydraulic motor with improved parking brake Aug. 6, 2013
8403655 Scroll compressor having an allowable angle of rotation Mar. 26, 2013
8333576 Power steering pump having intake channels with enhanced flow characteristics and/or a pressure balancing fluid communication channel Dec. 18, 2012
8221103 Fluid motor having improved braking effect Jul. 17, 2012
8157552 Rotary fluid pressure device and improved parking lock assembly therefor Apr. 17, 2012
8118576 Oil rotary vacuum pump and manufacturing method thereof Feb. 21, 2012
7866965 Inner gear being biased to pump cover due to meshing of inner and outer gears Jan. 11, 2011
7775782 Variable capacity rotary compressor having vane controller Aug. 17, 2010
7704059 Compressor having a helmholtz type resonance chamber with a lowermost end connected to a gas passage Apr. 27, 2010
7704060 Compressor having muffler outlets orthogonally arranged relative to the suction mouth Apr. 27, 2010
7588426 Oil rotary vacuum pump and manufacturing method thereof Sep. 15, 2009
7568898 Compressor sound suppression Aug. 4, 2009
7527484 Muffler of scroll compressor May. 5, 2009
7488162 Hydraulic pump for a power steering system Feb. 10, 2009
7484945 Compressor for refrigerator-freezer having a porous member Feb. 3, 2009
7438540 Two-stage rotary compressor Oct. 21, 2008
7381039 Rotary compressor having a stepped cover of a discharge muffler chamber Jun. 3, 2008
7361005 Rotary compressor having discharge muffling Apr. 22, 2008
7210913 Scroll fluid machine with a silencer May. 1, 2007
7189068 Sound reduced rotary vane compressor Mar. 13, 2007
7179069 Motor compressor lubrication Feb. 20, 2007
7174917 Inlet piece for a liquid-injected compressor element Feb. 13, 2007
7144233 Scroll fluid machine with a silencer Dec. 5, 2006
6790019 Rotary vane pump with multiple sound dampened inlet ports Sep. 14, 2004
6743002 Rotary fluid pressure device and improved integral brake assembly Jun. 1, 2004
6733258 Gas compressor apparatus having a discharge pulsation reducing cooler May. 11, 2004
6692244 Hydraulic pump utilizing floating shafts Feb. 17, 2004
6638043 Diffuser for high-speed screw compressor Oct. 28, 2003
6506029 Gear pump Jan. 14, 2003
6488488 Rotary helical screw-type compressor having an intake filter and muffler Dec. 3, 2002
6461132 Scroll compressor with unique mounting of non-orbiting scroll Oct. 8, 2002
6422842 Scroll compressor discharge muffler Jul. 23, 2002
6419472 Gear unit for a deep-borehole pump Jul. 16, 2002
6345966 Scroll compressor with dampening bushing Feb. 12, 2002
6331103 Fluid machine having a pair of rotors and a silencer Dec. 18, 2001
6287098 Muffler for rotary compressor Sep. 11, 2001
6241496 Hermetic rotary compressor Jun. 5, 2001
6220839 Scroll compressor discharge muffler Apr. 24, 2001
6158995 Sealed compressor having pipe connectors and method of joining pipe connectors to sealed casing Dec. 12, 2000
6158983 Pump having muffler for attenuating noise Dec. 12, 2000
6158989 Scroll compressor with integral outer housing and fixed scroll member Dec. 12, 2000
6142757 Integral oil pump Nov. 7, 2000
6132194 Low cost compact design integral brake Oct. 17, 2000
6109902 Liquid-injected compressor with at least two cooperating compressor elements Aug. 29, 2000
6106247 Scroll-type fluid displacement apparatus including an eccentric crank mechanism having an elongated shaft Aug. 22, 2000
6106242 Hermetic rotary compressor with resonance chamber Aug. 22, 2000
6082984 Fluid pump having pressure pulsation reducing passage Jul. 4, 2000

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