| Patents for F02B 71 - Free-piston engines; Engines without rotary main shaft (1,404) |
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| 04/18/2001 | EP1092851A2 Internal combustion engine and method of operating |
| 04/18/2001 | EP0772734B2 Hydraulic switching valve, and a free-piston engine provided therewith |
| 04/17/2001 | US6216647 Free piston internal combustion engine with piston head having non-metallic bearing surface |
| 04/17/2001 | US6216444 Combustion engine |
| 04/12/2001 | DE19948442A1 Plunger pump unit for high pressure operations has two co-axially opposed pump units between which is constructed free-piston engine equipped with stepped piston directly or indirectly connected to plungers of pump units |
| 04/10/2001 | US6213097 Engine working according to the method of pulsating combustion |
| 04/05/2001 | WO2001023721A1 Free-piston internal combustion engine |
| 03/27/2001 | US6206656 Method of operating a free piston internal combustion engine with high pressure hydraulic fluid upon misfire or initial start-up |
| 03/27/2001 | US6205961 Free piston internal combustion engine with piston head functioning as a bearing |
| 03/15/2001 | DE19943993A1 Internal combustion engine for motor vehicle, has linear generator with permanent magnet(s) on piston rod moved axially and reciprocally in coil winding when dual piston oscillates |
| 03/13/2001 | US6199519 Free-piston engine |
| 03/13/2001 | US6199381 DC centering of free piston machine |
| 03/13/2001 | CA2226449C Combustion powered tool with dual fans |
| 03/08/2001 | WO2001016463A1 Dc centering of free piston machines |
| 03/07/2001 | EP1080301A1 Piston for use in an engine |
| 02/21/2001 | EP1077318A1 Power generator |
| 02/15/2001 | WO2001011213A1 Free piston internal combustion engine with rotating piston |
| 01/30/2001 | US6181110 High-yield linear generator set, control method and traction unit therewith |
| 01/09/2001 | US6170442 Free piston internal combustion engine |
| 12/26/2000 | US6164250 Free piston internal combustion engine with piston head having a radially moveable cap |
| 12/21/2000 | WO2000077366A1 Cyclically operated fluid displacement machine |
| 12/13/2000 | EP1058779A1 Free-piston internal-combustion engine |
| 12/12/2000 | US6158401 Method of operating a free piston internal combustion engine with pulse compression |
| 11/28/2000 | US6152091 Method of operating a free piston internal combustion engine with a variable pressure hydraulic fluid output |
| 10/24/2000 | US6135069 Method for operation of a free piston engine |
| 10/24/2000 | US6135068 Method for absorbing the vibration of a free-piston engine and vibration-absorbed free-piston engine |
| 10/11/2000 | EP1042596A1 Device for digital hydraulic pressure transformation (dhpt) |
| 09/21/2000 | WO2000055482A1 Internal combustion engine with a linear electric a.c. generator |
| 09/20/2000 | EP0783618B1 Centering system with one way valve for free piston machine |
| 09/14/2000 | DE19945873A1 Small unit-type thermoelectric power generator is piston engine with no crankshaft with linear drive for control, working pistons, independently programmable oscillatory piston motion |
| 09/13/2000 | EP1035310A2 Piston engine with continuous combustion |
| 09/08/2000 | WO2000052314A1 Method of operating a free piston internal combustion engine with high pressure hydraulic fluid upon misfire or initial start-up |
| 09/07/2000 | DE19909689A1 Kolbenmotor mit kontinuierlicher Verbrennung Piston motor with continuous combustion |
| 08/31/2000 | WO2000050756A1 Free piston internal combustion engine with rotating piston |
| 08/31/2000 | WO2000050755A1 Method of operating a free piston internal combustion engine with a variable pressure hydraulic fluid output |
| 08/31/2000 | WO2000050754A1 Free piston internal combustion engine with pulse compression |
| 08/31/2000 | WO2000050753A1 Free piston internal combustion engine with piston head having non-metallic bearing surface |
| 08/31/2000 | WO2000050752A1 Method of operating a free piston internal combustion engine with pulse compression |
| 08/31/2000 | WO2000050751A1 Free piston internal combustion engine with piston head having a radially moveable cap |
| 08/31/2000 | WO2000050750A1 Method of operating a free piston internal combustion engine with a short bore/stroke ratio |
| 08/31/2000 | WO2000050749A1 Free piston internal combustion engine with piston head functioning as a bearing |
| 08/29/2000 | US6109222 Miniature reciprocating combustion-driven machinery |
| 08/22/2000 | US6105541 Free piston internal combustion engine with rotating piston |
| 08/10/2000 | DE19903674A1 Integrated high resolution digital position measurement for free-piston motor suitable as drive for generators, using measurement points arranged on linear generator connected to free-piston motor |
| 08/02/2000 | CN1261944A Free piston IC engine |
| 07/25/2000 | US6092456 Rodless power cylinder |
| 06/20/2000 | US6076506 Piston for use in an engine |
| 05/31/2000 | DE19852718A1 Kurbelwellenlose Verbrennungskraftmaschine Crankshaft lots internal combustion engine |
| 05/30/2000 | US6067796 Gas driven mechanical oscillator and method |
| 05/25/2000 | WO2000029732A1 Internal combustion engine without a crankshaft |
| 05/18/2000 | WO2000001933A3 Free piston internal combustion engine |
| 04/25/2000 | US6054775 Acoustically resonant internal combustion engine-generator (A.R.E.G.) |
| 04/19/2000 | EP0993548A1 Free piston internal combustion engine |
| 04/18/2000 | US6050244 Injector system for free-piston engines |
| 03/23/2000 | WO2000015954A1 Method for operation of a free piston engine |
| 03/15/2000 | EP0985087A1 Hydraulic drive system with constant pressure in pressure conduit |
| 03/14/2000 | US6035637 Free-piston internal combustion engine |
| 02/29/2000 | US6029616 Free piston engine |
| 02/02/2000 | EP0975861A1 Free piston engine provided with a purging air dosing system |
| 01/20/2000 | WO2000003133A1 Gas turbine engine coupled with an electric generator with regenerating system for thermal and mechanical recuperation eliminating polluting constituents |
| 01/20/2000 | CA2337274A1 Gas turbine engine coupled with an electric generator with regenerating system for thermal and mechanical recuperation eliminating polluting constituents |
| 01/13/2000 | WO2000001953A1 Fast working hydraulic valve |
| 01/13/2000 | WO2000001933A2 Free piston internal combustion engine |
| 11/25/1999 | WO1999060258A1 Piston for use in an engine |
| 11/25/1999 | CA2333236A1 Piston for use in an engine |
| 11/17/1999 | EP0957250A2 Internal combustion engine |
| 11/16/1999 | US5983638 Hydraulic switching valve, and a free piston engine provided therewith |
| 11/02/1999 | US5975034 Free piston internal combustion engine and starting methods |
| 10/07/1999 | DE19813992A1 Free piston combustion engine with electrical energy delivery e.g. for hybrid automobile, heating plant or mobile current generator |
| 10/06/1999 | EP0947680A2 Free-piston gas generator |
| 10/05/1999 | US5960698 Hydraulic cylinder |
| 09/30/1999 | WO1999049192A1 Method for controlling the power of a modular engine |
| 09/10/1999 | WO1999045633A1 Acoustically resonant internal combustion engine-generator (a.r.e.g.) |
| 09/07/1999 | CA2049292C Unsymmetrical free piston engine |
| 09/02/1999 | WO1999043936A1 Free-piston internal-combustion engine |
| 09/02/1999 | CA2320075A1 Free-piston internal-combustion engine |
| 07/29/1999 | DE19803180A1 IC engine/electric generator drive for cars |
| 07/21/1999 | EP0929740A1 Engine working according to the method of pulsating combustion |
| 07/08/1999 | WO1999034100A1 Device for digital hydraulic pressure transformation (dhpt) |
| 06/29/1999 | CA2190393C Linear electrical energy generator |
| 06/22/1999 | US5913290 Power plant |
| 06/10/1999 | WO1999028025A1 Pulsed device for gas compression |
| 04/20/1999 | US5894730 Internal combustion hydraulic motor and method of operation |
| 04/13/1999 | US5893343 Linear electrical energy generator |
| 03/18/1999 | DE19738375A1 Two-stroke piston engine-driven linear current generator |
| 03/10/1999 | EP0828928B1 Power plant |
| 03/10/1999 | CN1210201A Low speed small power energy-saving IC engine |
| 03/09/1999 | US5878569 Energy conversion system |
| 02/03/1999 | EP0754364A4 Fluid bearing with compliant linkage for centering reciprocating bodies |
| 02/02/1999 | US5865040 Gas driven mechanical oscillator and method |
| 01/14/1999 | WO1999001651A1 Free piston internal combustion engine |
| 01/14/1999 | DE19815395A1 Direct energy conversion from linear movement to electric in boxer engine or flat engine |
| 12/30/1998 | CN1203331A Rodless power cylinder |
| 12/23/1998 | CN1202588A Hydraulic cylinder |
| 12/17/1998 | DE19719800C1 Injector for free piston engine |
| 12/16/1998 | EP0884485A2 A rodless power cylinder |
| 12/03/1998 | WO1998054450A1 Hydraulic drive system with constant pressure in pressure conduit |
| 11/26/1998 | DE19815385A1 Boxer engine comprising cylinders and pistons |
| 11/18/1998 | EP0877858A1 An improvement in free-piston devices |
| 11/18/1998 | EP0877857A1 A method for controlling the stroke of a diesel free-piston gas generator |