| Patents for F04C 21 - Oscillating-piston pumps specially adapted for elastic fluids (244) |
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| 03/27/2008 | WO2008034331A1 Ball-shape compressor and expansion compressor capable of realizing multistage compression |
| 03/18/2008 | US7344363 Remedies to prevent cracking in a liquid system |
| 02/13/2008 | EP1885341A2 Portable drug delivery device including a detachable and replaceable administration or dosing element |
| 11/07/2007 | EP1851438A1 System and method for controlling a variable speed compressor during stopping |
| 11/07/2007 | CN200971863Y CO2 spherical expansion compressor |
| 11/07/2007 | CN101067380A Oscillating piston mechanical piston radial sealing parts end sealing parts full-closed ring connection |
| 10/18/2007 | WO2007115389A1 Positive displacement plant |
| 10/09/2007 | US7278549 Remedies to prevent cracking in a liquid system |
| 09/13/2007 | DE102006011560A1 Verdichter mit Schwenkkolben Rocking piston compressor |
| 08/15/2007 | CN101016844A Golden proportion of design for oscillating-piston mechanical structure |
| 07/26/2007 | WO2007084014A1 Enhancements for swash plate pumps |
| 06/21/2007 | WO2007069564A1 Compressor |
| 05/30/2007 | CN1971049A Roller type compressor with concentric rings |
| 05/23/2007 | CN1966983A Rotating and swing type compressor structure |
| 05/10/2007 | US20070104600 Oscillating piston pump |
| 05/10/2007 | US20070104587 Evacuation apparatus |
| 04/11/2007 | CN1945020A Air discharge valve structure design of large displacement high pressure swinging piston compressor |
| 03/21/2007 | CN1932293A Ball-shape compressor and expansion compressor capable of realizing multi-stage compression |
| 02/08/2007 | WO2006127905A3 Portable drug delivery device |
| 02/08/2007 | US20070031275 Fluid machine |
| 02/07/2007 | CN1908439A Integrated multiple cylinder multiple level oscillating-piston compressor with super-large displacement ultra-high pressure pistons in series |
| 12/13/2006 | EP1730423A1 Limited slip differential with friction using a pressure generating device |
| 11/30/2006 | WO2006127905A2 Portable drug delivery device |
| 11/30/2006 | US20060271020 Portable drug delivery device including a detachable and replaceble administration or dosing element |
| 11/30/2006 | CA2609351A1 Protable drug delivery device |
| 11/15/2006 | CN1284930C 制冷剂压缩机 Refrigerant compressor |
| 11/08/2006 | CN1858450A Swing piston compressor end surface sealing device |
| 11/02/2006 | WO2006116647A2 Hydraulic actuation assembly |
| 10/25/2006 | EP1714036A1 Sealing surfaces between a wavy rotor collar and a displaceable slide of a plump |
| 08/31/2006 | US20060193735 Oscillating type compressor |
| 08/16/2006 | CN1818388A Partitioned swing piston pump |
| 06/28/2006 | EP1673539A2 Evacuation apparatus |
| 05/31/2006 | CN1780988A Pump |
| 05/17/2006 | CN2781035Y 空气压缩机 Air compressor |
| 05/10/2006 | CN1771395A Fluid machine |
| 04/20/2006 | DE102005010775B3 Rotatable reciprocating engine for use as compressor, has two pistons revolving in housing, in which centrifugal forces arising due to revolution of pistons act in pivoting direction of pistons during revolution of pistons |
| 03/22/2006 | CN2766065Y Air compressor |
| 02/08/2006 | CN2756869Y Air compressor |
| 01/04/2006 | EP1612425A1 Fluid machine |
| 12/29/2005 | WO2005038255B1 Evacuation apparatus |
| 12/28/2005 | EP1608874A2 Pump |
| 11/03/2005 | WO2005038255A3 Evacuation apparatus |
| 07/28/2005 | WO2005068840A1 Fluid machine |
| 07/20/2005 | CN1211585C Capacitance variable type mechanism used for compressors |
| 06/15/2005 | CN1626818A Lubricating oil supplying device in reciprocal type compressor |
| 04/28/2005 | WO2005038255A2 Evacuation apparatus |
| 02/16/2005 | CN1189663C Pump with swinging rotor |
| 01/06/2005 | WO2004088141A3 Oscillating piston pump |
| 12/22/2004 | CN2665412Y Integrated double-cylinder piston pump |
| 11/24/2004 | CN1177131C Rotary piston machine |
| 10/14/2004 | WO2004088141A2 Oscillating piston pump |
| 10/14/2004 | DE10319671A1 Pumpe Pump |
| 10/06/2004 | EP1334265A4 Fluid power transfer device |
| 06/23/2004 | CN2621232Y Water-cooled non-lubricated oscillating compressor |
| 04/14/2004 | CN1488857A 制冷剂压缩机 A refrigerant compressor |
| 03/24/2004 | CN2607458Y Displacement compressor |
| 03/10/2004 | CN1481471A Fluid power transfer device |
| 09/17/2003 | CN1442602A 旋转活塞机 Rotary piston machine |
| 08/13/2003 | EP1334265A1 Fluid power transfer device |
| 07/23/2003 | CN1431400A Capacitance variable type mechanism used for compressors |
| 07/02/2003 | EP1323926A2 Pump |
| 04/09/2003 | CN1105225C Reciprocating rotary piston system and pressure pump and IC engine using same |
| 03/19/2003 | CN2540526Y Oscillating piston type compressor slipper with oil groove |
| 03/12/2003 | CN1402812A Apparatus using oscillating rotating pistons |
| 01/01/2003 | CN2528973Y Cylinder with oil groove of oscillating piston compressor |
| 01/01/2003 | CN2528972Y Cylinder assembly with sealing piston |
| 01/01/2003 | CN2528971Y Integral piston with oil-groove on vane |
| 09/25/2002 | EP1242727A1 Apparatus using oscillating rotating pistons |
| 08/15/2002 | US20020110459 Rotary vane pump |
| 07/02/2002 | US6413064 Pump |
| 06/12/2002 | CN1353248A Pump with swinging rotor |
| 06/11/2002 | US6401686 Apparatus using oscillating rotating pistons |
| 05/21/2002 | US6390052 Wobble engine |
| 04/25/2002 | WO2002033238A1 Fluid power transfer device |
| 04/25/2002 | CA2426179A1 Fluid power transfer device |
| 04/18/2002 | US20020043238 Wobble engine |
| 03/06/2002 | CN2480586Y Zero freedom semisphere swing rotor pump |
| 01/23/2002 | CN2473360Y Fan shape cylinder |
| 11/27/2001 | US6321693 Reciprocating rotary piston system and pressure pump and internal combustion engine using the same |
| 11/14/2001 | CN1321823A New piston working device internal combustion engine, piston motor, piston pump and application equipment |
| 08/07/2001 | CA2063888C Orbiting rotary compressor |
| 06/20/2001 | EP1108144A1 Pump |
| 06/14/2001 | WO2001042635A1 Apparatus using oscillating rotating pistons |
| 06/14/2001 | CA2392735A1 Apparatus using oscillating rotating pistons |
| 06/06/2001 | CN2433425Y Oscillating rotor refrigeration compressor |
| 02/28/2001 | CN2421431Y Oscillating rotor type displacement pump |
| 01/24/2001 | CN1281527A Reciprocating rotary piston system and pressure pump and IC engine using same |
| 01/11/2001 | WO2000009888A3 Pump |
| 06/02/2000 | CA2308924A1 Reciprocating rotary piston system and pressure pump and internal combustion engine using the same |
| 02/24/2000 | WO2000009888A2 Pump |
| 02/11/1998 | CN1172911A Oscillating rotor type fluid compressor |
| 12/16/1997 | CA2045400C Power conversion machine with pistons rotating in pairs relative to each other in a spherical housing |
| 05/29/1996 | CN2228148Y Oscillating compressor adapted for new refrigerant |
| 04/10/1996 | EP0705977A1 Compressor/vacuum pump reed valve |
| 10/10/1995 | US5456287 Compressor/vacuum pump reed valve |
| 03/07/1995 | CA1334661C Valve arrangement for pump or compressor |
| 01/24/1995 | US5383773 Orbiting rotary compressor having axial and radial compliance |
| 06/08/1994 | CN1087703A Winging rotor machine for changing mechanical energy into fluid pressure energy |
| 04/12/1994 | US5302095 Orbiting rotary compressor with orbiting piston axial and radial compliance |
| 10/20/1993 | EP0456713B1 Arrangement of pumps or similar machines |