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Class Information
Number: 418/5
Name: Rotary expansible chamber devices > Multistage
Description: Apparatus in which there is provided a plurality of working chambers, at least one of the working chambers serially receiving its working fluid at least in part form one other working chamber, the working fluid either acting on or being acted upon by the working member in each working chamber.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7618245 |
Fluid machine |
Nov. 17, 2009 |
| 7404705 |
Blending pump assembly |
Jul. 29, 2008 |
| 7381036 |
Motor-pump unit |
Jun. 3, 2008 |
| 7293970 |
Two-stage rotary compressor |
Nov. 13, 2007 |
| 7189066 |
Light gas vacuum pumping system |
Mar. 13, 2007 |
| 7156922 |
Multi-chamber installation for treating objects under vacuum, method for evacuating said installation and evacuation system therefor |
Jan. 2, 2007 |
| 7131826 |
Blending pump assembly |
Nov. 7, 2006 |
| 7108492 |
Roots pump |
Sep. 19, 2006 |
| 7059294 |
Orbital engine |
Jun. 13, 2006 |
| 6931866 |
Multistage compression type rotary compressor and cooling device |
Aug. 23, 2005 |
| 6929455 |
Horizontal two stage rotary compressor |
Aug. 16, 2005 |
| 6887058 |
Fluid machinery |
May. 3, 2005 |
| 6884047 |
Compact scroll pump |
Apr. 26, 2005 |
| 6764288 |
Two stage scroll vacuum pump |
Jul. 20, 2004 |
| 6752605 |
Horizontal two stage rotary compressor with a bearing-driven lubrication structure |
Jun. 22, 2004 |
| 6699022 |
Vacuum exhaust apparatuses and vacuum exhaust methods |
Mar. 2, 2004 |
| 6638040 |
Dry vacuum pump |
Oct. 28, 2003 |
| 6439864 |
Two stage scroll vacuum pump with improved pressure ratio and performance |
Aug. 27, 2002 |
| 6267572 |
Scroll fluid machine having scroll members at each end of a rotating hollow shaft |
Jul. 31, 2001 |
| 6174440 |
Device and method for processing a fluid by two-phase compression and fractionation |
Jan. 16, 2001 |
| 6164939 |
Scroll pump |
Dec. 26, 2000 |
| 6123526 |
Multistage pump and method for assembling the pump |
Sep. 26, 2000 |
| 6113358 |
Scroll compressors |
Sep. 5, 2000 |
| 6050792 |
Multi-stage scroll compressor |
Apr. 18, 2000 |
| 5961297 |
Oil-free two stage scroll vacuum pump and method for controlling the same pump |
Oct. 5, 1999 |
| 5951268 |
Sperial vacuum pump having a metal bellows for limiting circular translation movement |
Sep. 14, 1999 |
| 5947694 |
Scroll-type vacuum pumping apparatus |
Sep. 7, 1999 |
| 5855473 |
High displacement rate,scroll-type, fluid handling apparatus |
Jan. 5, 1999 |
| 5616015 |
High displacement rate, scroll-type, fluid handling apparatus |
Apr. 1, 1997 |
| 5588818 |
Rotor-to-rotor coupling |
Dec. 31, 1996 |
| 5304047 |
Scroll compressor of two-stage compression type having an improved volumetric efficiency |
Apr. 19, 1994 |
| 5299922 |
Positive displacement rotary pump |
Apr. 5, 1994 |
| 5195880 |
Eccentric screw pump with reversible rotor |
Mar. 23, 1993 |
| 5071327 |
Two speed gerotor motor with centrally located valve and commutator |
Dec. 10, 1991 |
| 4846638 |
Rotary fluid machine with pivoted vanes |
Jul. 11, 1989 |
| 4764094 |
Screw machine having a plurality of symmetrically arranged rotors |
Aug. 16, 1988 |
| 4711006 |
Downhole sectional screw motor, mounting fixture thereof and method of oriented assembly of working members of the screw motor using the mounting fixture |
Dec. 8, 1987 |
| 4650405 |
Scroll pump with axially spaced pumping chambers in series |
Mar. 17, 1987 |
| 4619594 |
Stackable rotary vane pump with improved volumetric efficiency |
Oct. 28, 1986 |
| 4611975 |
Scroll type compressor or pump with axial pressure balancing |
Sep. 16, 1986 |
| 4585401 |
Multistage helical down-hole machine with frictional coupling of working elements, and method therefor |
Apr. 29, 1986 |
| 4580955 |
Eccentric screw pump for the conveying of liquids from bore holes |
Apr. 8, 1986 |
| 4477238 |
Scroll type compressor with wrap portions of different axial heights |
Oct. 16, 1984 |
| 4457674 |
High efficiency scroll type compressor with wrap portions having different axial heights |
Jul. 3, 1984 |
| 4192152 |
Scroll-type fluid displacement apparatus with peripheral drive |
Mar. 11, 1980 |
| 3994633 |
Scroll apparatus with pressurizable fluid chamber for axial scroll bias |
Nov. 30, 1976 |
| 3951576 |
Rotary diaphragm pump |
Apr. 20, 1976 |
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