| Patents for F02B 71 - Free-piston engines; Engines without rotary main shaft (1,404) |
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| 05/19/2010 | CN101142060B Venting check valve for combustion nailer |
| 05/12/2010 | CN101705863A Engine stroke limiting device |
| 05/06/2010 | DE102008053069A1 Freikolbenmotor mit variablem Hub und Verfahren zum Betreiben eines Freikolbenmotors A free piston engine with a variable stroke and method of operating a free-piston engine |
| 04/29/2010 | WO2010046121A1 Free-piston engine having variable hub, method for operating a free-piston engine and use of openings in a piston receptacle |
| 04/29/2010 | DE102008053068A1 Freikolbenmotor mit variablem Hub, Verfahren zum Betreiben eines Freikolbenmotors und Verwendung von Öffnungen in einer Kolbenaufnahme A free piston engine with a variable stroke, method of operating a free-piston engine and using openings in a piston seat |
| 04/29/2010 | DE102008030633B4 Verfahren zum Betreiben einer Freikolbenvorrichtung A method of operating a free-piston device |
| 04/28/2010 | CN1867759B Hybrid two cycle engine, compressor and pump, and method of operation |
| 04/21/2010 | EP2178191A2 Free-piston unit |
| 04/14/2010 | CN101694164A Cylinder type propeller as well as driving and application thereof |
| 03/24/2010 | CN101680362A Rapid-fire rapid-response power conversion system |
| 03/18/2010 | DE102008042169A1 Free-piston internal combustion engine for hybrid drive device of motor vehicle, has electric linear drive and piston device with piston and rotor device |
| 03/17/2010 | CN100594297C Fully-controlled, free-piston engine |
| 03/04/2010 | DE102008038469A1 Circular combustion chamber for production of electric current in industrial application, has fresh air supply, fuel supply and set of cooling elements for extracting heat, where chamber is surrounded by electrical coils |
| 03/03/2010 | CN101660447A Novel stationary point free piston engine |
| 02/24/2010 | CN201412219Y Straight shaft hydraulic internal combustion engine |
| 02/17/2010 | CN101652546A Rotary mechanically reciprocated sliding metal vane air pump and boundary layer gas turbines integrated with a pulse gas turbine engine system |
| 01/21/2010 | US20100011759 Device and method for converting energy |
| 01/20/2010 | EP2145089A2 Rapid-fire rapid-response power conversion system |
| 01/13/2010 | EP2142341A1 Exhaust check valve and piston return system |
| 12/31/2009 | US20090320799 Drive system with a rotary energy-transmission element |
| 12/31/2009 | DE102008030633A1 Verfahren zum Betreiben einer Freikolbenvorrichtung A method of operating a free-piston device |
| 12/30/2009 | WO2009156257A1 Method for operating a floating piston device |
| 12/30/2009 | EP2138687A1 Drive system with a rotary energy-transmission element |
| 12/23/2009 | WO2009133304A3 Pulse detonation engine |
| 12/23/2009 | EP2134946A1 Device for a combustion engine associated with a linearly movable induction coil |
| 12/23/2009 | CN100572786C Device and method for converting energy |
| 12/22/2009 | US7634979 Combustion-powered linear air motor/compressor |
| 12/17/2009 | DE202009013977U1 Freikolbenaggregat Free-piston unit |
| 12/02/2009 | CN101592077A Internal combustion engine |
| 11/25/2009 | EP1269610B1 An electrical machine |
| 11/17/2009 | US7618243 Linear compressor controller |
| 11/11/2009 | CN100559020C Axially driven piston/cylinder unit |
| 11/05/2009 | WO2009133304A2 Pulse detonation engine |
| 10/28/2009 | EP2112351A1 Pulsed detonation engine |
| 10/28/2009 | CN101566106A Compression stroke realization device of two-stroke hydraulic free piston engine |
| 10/22/2009 | DE102005063408B4 Kraftstoffeinspritzung für einen Freikolbenmotor Fuel injection for a free piston engine |
| 10/21/2009 | CN201330646Y Inertia rotary power engine |
| 10/15/2009 | US20090255513 Deformable chamber-based homogeneous charge combustion ignition (HCCI) engine and generator |
| 10/14/2009 | CN101555831A Inertia rotary engine |
| 10/14/2009 | CN101555830A Free-piston rotary engine |
| 10/14/2009 | CN101555829A Free piston load response engine |
| 10/07/2009 | EP2106495A2 Free-piston engine |
| 09/22/2009 | US7591249 Actuation structure for internal fuel cell metering valve and associated combustion tool |
| 09/22/2009 | US7591236 Venting check valve for combustion nailer |
| 09/17/2009 | WO2009113114A1 System for storing and using pressure energy freed in a controlled sequence of explosions |
| 09/16/2009 | CN101532427A Four-stroke hydraulic engine without crank link mechanism |
| 09/15/2009 | US7587971 Pneumatic actuator for precision servo type applications |
| 09/08/2009 | US7584723 Combustion powered fastener-driving tool with interconnected chambers |
| 09/02/2009 | CN101520000A Single-piston hydraulic free-piston engine with vibration damping scavenging pumps |
| 08/19/2009 | EP1615684B1 Portable combustion-powered device with priming combustion chamber and main combustion chamber |
| 08/19/2009 | CN100530933C Resonant electrical generation system |
| 08/19/2009 | CN100529376C Piston assembly for sodium combustion jar of an engine and free piston engine |
| 08/13/2009 | WO2009073406A3 Rotary mechanically reciprocated sliding metal vane air pump and boundary layer gas turbines integrated with a pulse gas turbine engine system |
| 08/12/2009 | CN201288609Y Free piston type rotary power engine |
| 08/12/2009 | CN201288608Y Free piston type load response engine |
| 07/29/2009 | CN101495730A Hydraulic engine |
| 07/23/2009 | DE19909689B4 Kolbenmotor mit kontinuierlicher Verbrennung Piston motor with continuous combustion |
| 07/23/2009 | DE102008004879A1 Free piston engine for e.g. excavator, has heat engine with free pistons, linear generator driven by heat engine for generating electrical energy, and pump assembly driven by heat engine for generating hydraulic and/or pneumatic energy |
| 07/02/2009 | WO2009079687A1 A four-stroke free piston internal combustion engine |
| 07/01/2009 | CN100507232C Air preheating micro-free-piston engine for common use of intake pipe and exhaust pipe |
| 06/25/2009 | US20090159050 Fuel Supply and Combustion Chamber Systems for Fastener-Driving Tools |
| 06/18/2009 | DE102006019787B4 Hybride kolbenhydraulische Kraftmaschine in Freiflugkolbenbauart als Druckquelle für Allzweckverwendung Hybrid hydraulic piston-engine piston type in free flight as a source for general purpose use |
| 06/16/2009 | US7546938 Fuel cell compartment for combustion-powered tool |
| 06/11/2009 | WO2009073406A2 Rotary mechanically reciprocated sliding metal vane air pump and boundary layer gas turbines integrated with a pulse gas turbine engine system |
| 05/20/2009 | DE102007056527A1 Low-emission internal combustion engine, has low-emission counter piston-two-stroke engine or emission-free formed single-piston engine of two or four-stroke design equipped with machines and/or pumps arranged directly to drive piston |
| 05/13/2009 | EP1904723B1 Ammonia generator, vehicle and method for generating ammonia |
| 05/13/2009 | EP1504176A4 Internal combustion engine |
| 04/29/2009 | CN100482925C Combustion chamber arrangement in combustion type power tool |
| 04/21/2009 | US7520252 Methods for adjusting the power of a gas-operated apparatus |
| 04/16/2009 | US20090095260 method to convert free-piston linear motion to rotary motion |
| 04/09/2009 | WO2008156897A3 Rapid-fire rapid-response power conversion system |
| 04/08/2009 | EP2044305A2 Hydraulic engine |
| 03/25/2009 | EP2039554A2 Series and parallel hybrid drive with two primary drive units |
| 03/05/2009 | DE102007040361A1 Free piston engine for e.g. motor vehicle, has compression storage whose pressure is communicated to computer by sensor, where compression pressure and time are respectively controlled by control and switching valves based on fuel condition |
| 03/04/2009 | CN101377150A Double-group element single-piston type hydraulic free piston engine |
| 03/03/2009 | US7497271 Method of operating a combustion -powered tool |
| 02/26/2009 | WO2009024608A1 Asynchronous electrical generator with a free-piston motor |
| 02/26/2009 | WO2008156897A9 Rapid-fire rapid-response power conversion system |
| 02/25/2009 | CN101375018A System and method for electrically-coupled thermal cycle |
| 02/25/2009 | CN101372913A Double group component hydraulic free-piston engine |
| 02/17/2009 | US7490582 Combustion type power tool having fin for effectively cooling cylinder |
| 02/05/2009 | WO2009015596A1 A forced vibration directly driving generation system with an accelerating spring |
| 02/05/2009 | US20090031991 Method And System For Controlling A Free-Piston Energy Converter |
| 02/03/2009 | US7484481 Combustion-type power tool having switch protection arrangement |
| 01/29/2009 | DE102007035914A1 Freikolbenvorrichtung und Verfahren zur Steuerung und/oder Regelung einer Freikolbenvorrichtung Free-piston device and method for controlling and / or regulating a free-piston device |
| 01/28/2009 | EP2019192A2 Free-piston internal combustion engine |
| 01/14/2009 | EP1354395B1 Power pack for cordless tools and electronics |
| 01/07/2009 | EP2010772A1 Energy converter having pistons with internal gas passages |
| 12/24/2008 | CN100445531C Double-piston hydraulic engine |
| 12/23/2008 | US7467607 Free piston vacuum producing apparatus |
| 12/17/2008 | CN101326350A Fuel supply and combustion chamber systems for fastener-driving tools |
| 12/16/2008 | US7464534 Pulsed detonation engine |
| 12/03/2008 | CN100439654C Internal combustion engine |
| 11/25/2008 | US7455037 Gas fastening apparatus having an internal combustion engine and gas induction device connected by a flexible tube |
| 11/25/2008 | US7455036 Combustion type power tool having fin in low turbulent combustion region within combustion chamber |
| 11/13/2008 | US20080276613 Discrete variable geometry compressor |
| 11/12/2008 | EP1222373B1 Free-piston internal combustion engine |
| 11/06/2008 | WO2008065081A3 Free-piston engine |
| 11/06/2008 | US20080271711 Four-Stroke Free Piston Engine |
| 11/04/2008 | US7444963 Combustion power tool |