| Patents for F01B 7 - Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (730) |
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| 10/24/2007 | CN100344871C Piston type gas compressor, and piston type gas pressure drive rotation device |
| 10/16/2007 | US7281527 Internal combustion engine and working cycle |
| 10/04/2007 | WO2007109836A1 Magnetic drive fluid pump |
| 09/20/2007 | WO2007053351A3 Internal combustion engine |
| 09/20/2007 | US20070215093 Opposed piston internal-combustion engine with hypocycloidal drive and generator apparatus |
| 09/20/2007 | US20070214953 Combined service brake and spring brake cylinder assembly |
| 08/29/2007 | EP1614876A4 Piston mechanism provided with divergent pistons |
| 08/14/2007 | US7255070 Internal combustion engine |
| 06/21/2007 | WO2007069915A1 Reciprocating piston machine |
| 05/31/2007 | WO2006088730A3 Reciprocating compressor frame |
| 05/29/2007 | US7222614 Internal combustion engine and working cycle |
| 05/24/2007 | DE19911669B4 Zweitaktmotor Two-stroke engine |
| 05/18/2007 | WO2004090338A3 Dynamic system for refrigeration equipment |
| 05/08/2007 | CA2309706C Radial piston hydraulic motor |
| 04/24/2007 | US7207299 Internal combustion engine |
| 03/29/2007 | WO2007035159A1 An engine arrangement |
| 03/29/2007 | CA2623307A1 An engine arrangement |
| 03/20/2007 | US7191697 Piston mechanism with diverging pistons |
| 03/15/2007 | WO2007030076A1 A two-stroke engine with variable compression |
| 03/01/2007 | DE102006031984A1 Verbrennungsmotor Combustion engine |
| 02/15/2007 | US20070035177 Sealed parking brake section for tamper resistant brake actuator |
| 02/08/2007 | US20070028761 Spring-actuated air-brake cylinder for vehicle brake systems |
| 02/06/2007 | US7171890 Telescopic lifting device |
| 02/06/2007 | US7171807 Oil circuitry for two-stage telescoping transmission jack |
| 01/25/2007 | US20070017365 Actuator for a brake system and method of making a brake actuator |
| 01/14/2007 | CN1134471C Process for preparing water-absorbent resin |
| 12/07/2006 | US20060272492 Composite operation type actuator |
| 11/08/2006 | CN2835599Y Double-piston four-stroke cylinder system for internal combustion engine |
| 11/08/2006 | CN1858418A Overriding opposed piston rack-type driving engine |
| 10/17/2006 | US7121191 Air-operated brake actuator with control valve |
| 10/05/2006 | WO2006105390A1 Opposed piston, homogeneous charge pilot ignition engine |
| 10/05/2006 | CA2600349A1 Opposed piston, homogeneous charge pilot ignition engine |
| 10/03/2006 | US7114429 Power steering assist apparatus and method of retrofitting |
| 09/28/2006 | US20060213466 Internal combustion engine |
| 09/20/2006 | CN2818817Y Horizontal opposed-double cylinder gasoline engine |
| 09/19/2006 | US7107768 Hydraulic system |
| 09/14/2006 | US20060201456 Internal combustion engine |
| 08/22/2006 | US7095482 Multiple system vibration isolator |
| 08/17/2006 | US20060180015 Piston mechanism provided with divergent pistons |
| 06/15/2006 | WO2006060859A1 Improved engine and pump |
| 04/27/2006 | DE202005019063U1 IC motor, with a combined free piston and reciprocating piston action, has the pistons in a coaxial array within a common housing |
| 04/26/2006 | CN1764774A Piston mechanism provided with divergent pistons |
| 04/19/2006 | CN2773323Y Energy-saving engine |
| 03/15/2006 | CN2764939Y Crank pitman mechanism used for opposite-vertex piston mechanical equipment |
| 01/25/2006 | EP1618309A2 Dynamic system for refrigeration equipment |
| 01/17/2006 | US6986328 Rotary piston machine |
| 01/11/2006 | EP1614876A1 Piston mechanism provided with divergent pistons |
| 12/06/2005 | US6971301 Asymmetrically accelerated vibrator for feeding materials |
| 11/29/2005 | US6968688 Two-cycle hot-gas engine |
| 11/24/2005 | WO2005111374A1 Double-acting engine with a collector shaft and a sprocket wheel |
| 10/13/2005 | US20050224059 Variable flow reducing valve and gradual control valve distribution system for a compressed air injection engine operating on mono or multi energy and other engines or compressors |
| 10/06/2005 | DE202005011561U1 Piston engine has second cylinder connected to first cylinder via narrow neck and moving through cylinder, to reduce pressure losses |
| 10/05/2005 | CN2731117Y Pair piston type intenral combustion engine |
| 10/05/2005 | CN2731116Y Improved pair-piston internal combustion engine |
| 10/05/2005 | CN2731115Y Pair piston type double-cylinder internal combustion engine |
| 10/04/2005 | US6951211 Cold air super-charged internal combustion engine, working cycle and method |
| 09/20/2005 | US6945202 Free piston engine and power generation system therewith |
| 08/10/2005 | CN1653251A Internal combustion engine |
| 08/10/2005 | CN1651732A 新型发动机 The new engine |
| 06/14/2005 | US6904877 Piston motion modifiable internal combustion engine |
| 06/02/2005 | US20050115547 Internal combustion engine and working cycle |
| 05/26/2005 | US20050109295 Free piston engine and power generation system therewith |
| 05/24/2005 | US6895854 Power cylinder apparatus for supplying varying actuation forces |
| 05/19/2005 | US20050103287 Internal combustion engine |
| 05/18/2005 | EP1499797A4 Single-ended barrel engine with double-ended, double roller pistons |
| 05/12/2005 | US20050098162 Internal combustion engine and working cycle |
| 05/12/2005 | US20050098028 Asymmetrically accelerated vibrator for feeding materials |
| 04/13/2005 | EP1522690A2 Improved internal combustion engine and working cycle |
| 04/13/2005 | EP1268978A4 Piston motion modifiable internal combustion engine |
| 04/12/2005 | US6879984 Analytical database system that models data to speed up and simplify data analysis |
| 03/31/2005 | US20050066917 Rotary piston machine |
| 03/17/2005 | WO2005024205A1 Improvements to internal combustion engines |
| 02/23/2005 | CN1584306A Double-cylinder IC engines |
| 02/09/2005 | EP1504176A2 Internal combustion engine |
| 02/02/2005 | EP1502006A1 Variable flow reducing valve and gradual control valve distribution system for a compressed air injection engine operating on mono or multi energy and other engines or compressors |
| 01/26/2005 | EP1499799A1 Rotary piston machine |
| 01/26/2005 | EP1499797A1 Single-ended barrel engine with double-ended, double roller pistons |
| 01/06/2005 | US20050000349 Deck gun elevator |
| 12/02/2004 | WO2004104376A1 An engine with drive ring |
| 11/25/2004 | US20040231620 Engine with drive ring |
| 11/18/2004 | US20040226436 Tandem cylinder apparatus and method of using same |
| 11/03/2004 | EP1451456A4 Integral air compressor for boost air in barrel engine |
| 10/07/2004 | WO2004085809A1 Piston mechanism provided with divergent pistons |
| 09/01/2004 | EP1451456A1 Integral air compressor for boost air in barrel engine |
| 07/01/2004 | US20040123849 Cold air super-charged internal combustion engine, working cycle & method |
| 06/30/2004 | EP0787252B1 A dual piston internal combustion engine |
| 04/15/2004 | WO2004031538A1 Reciprocating piston engine |
| 04/08/2004 | US20040065308 Internal combustion engine and working cycle |
| 03/18/2004 | US20040050347 Piston motion modifiable internal combustion engine |
| 02/24/2004 | CA2121142C Internal combustion rotary piston engine |
| 12/16/2003 | US6662775 Integral air compressor for boost air in barrel engine |
| 12/04/2003 | WO2003078809A3 Internal combustion engine |
| 11/26/2003 | EP1365126A2 Improved internal combustion engine and working cycle |
| 11/13/2003 | WO2003093662A1 Single-ended barrel engine with double-ended, double roller pistons |
| 10/30/2003 | WO2003089769A1 Rotary piston machine |
| 10/30/2003 | WO2003089764A1 Variable flow reducing valve and gradual control valve distribution system for a compressed air injection engine operating on mono or multi energy and other engines or compressors |
| 10/30/2003 | CA2486227A1 Variable flow reducing valve and gradual control valve distribution system for a compressed air injection engine operating on mono or multi energy and other engines or compressors |
| 10/22/2003 | EP1355053A1 Rotary piston engine |
| 10/07/2003 | US6629514 Two stroke gasoline engine with rotary valve enabling double acting power strokes and rotary air valve to lessen blowback |
| 09/25/2003 | WO2003078835A1 Engine with pumping capability |