| 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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| 08/06/1996 | US5542382 Dual compression and dual expansion internal combustion engine and method therefor |
| 07/24/1996 | EP0722532A1 Opposed piston engines |
| 07/04/1996 | DE19504537A1 Diesel, etc. engine design |
| 04/25/1996 | WO1996012096A1 A dual piston internal combustion engine |
| 04/25/1996 | CA2200213A1 A dual piston internal combustion engine |
| 04/16/1996 | US5507253 Adiabatic, two-stroke cycle engine having piston-phasing and compression ratio control system |
| 04/03/1996 | EP0704027A1 Twin piston power cylinder |
| 03/28/1996 | WO1996009465A1 Adiabatic, two-stroke cycle engine having piston phasing and compression ratio control system |
| 12/13/1995 | EP0604533B1 Internal combustion engine having opposed pistons |
| 11/15/1995 | CN1111711A Taumelscheiben-maschine, insbesondere brennkraftmaschine |
| 11/08/1995 | EP0680551A1 Dual compression and dual expansion internal combustion engine and methodtherefor. |
| 11/08/1995 | EP0680546A1 Internal combustion rotary piston engine |
| 08/15/1995 | US5441018 Internal combustion rotary piston engine |
| 07/19/1995 | EP0663513A1 Swashplate internal combustion engine |
| 04/20/1995 | DE4335515A1 Opposed-piston two-stroke internal combustion engine with spark ignition, direct fuel injection into the cylinder and stratified charge |
| 04/06/1995 | DE4401327C1 Swash plate machine, especially internal combustion engine |
| 03/23/1995 | WO1995006197A3 Adiabatic, two-stroke cycle engine |
| 03/02/1995 | WO1995006197A2 Adiabatic, two-stroke cycle engine |
| 02/14/1995 | CA1334398C Piston engine with dynamic groove bearing internal to piston and isolated from compression space |
| 02/02/1995 | WO1995003483A1 Dwelling scotch yoke engine |
| 01/19/1995 | DE4323858A1 Piston for a reciprocating piston internal combustion engine and reciprocating piston internal combustion engine with such a piston |
| 12/28/1994 | EP0631040A1 Four-stroke internal combustion engine |
| 12/27/1994 | US5375567 Adiabatic, two-stroke cycle engine |
| 12/22/1994 | WO1994029601A1 Twin piston power cylinder |
| 12/22/1994 | CA2165199A1 Twin piston power cylinder |
| 11/08/1994 | US5362219 Internal combustion engine with compound air compression |
| 10/20/1994 | DE4332548A1 Power boosting by means of levers for reciprocating engines |
| 08/30/1994 | US5341725 Twin piston power cylinder |
| 08/04/1994 | DE4407506A1 I.C. piston engine with two centre-symmetrical pistons |
| 07/27/1994 | EP0607154A1 Energy converter on the hot-air engine principle. |
| 07/26/1994 | US5331926 Dwelling scotch yoke engine |
| 07/26/1994 | US5331925 Internal combustion engine |
| 07/13/1994 | CN1025448C Sleeve type inflator |
| 07/06/1994 | EP0604533A1 Internal combustion engine having opposed pistons. |
| 07/04/1994 | EP0680546A4 Internal combustion rotary piston engine. |
| 05/11/1994 | WO1994010424A1 Opposed piston engines |
| 05/11/1994 | CN1086584A Noiceless IC engine |
| 04/20/1994 | EP0593090A1 Dual compression and dual expansion internal combustion engine and method therefor |
| 04/20/1994 | EP0593089A1 Dual compression and dual expansion internal combustion engine and method therefor |
| 04/20/1994 | EP0464201B1 Rotary sleeve valve-carrying internal combustion engine |
| 03/02/1994 | CN1023911C Multipurpose pump for inflating and sucking liquid |
| 03/01/1994 | US5289802 Internal combustion engine having opposed pistons |
| 02/25/1994 | EP0680551A4 Dual compression and dual expansion internal combustion engine and methodtherefor. |
| 01/20/1994 | WO1994001670A1 Energy converter on the hot-air engine principle |
| 01/20/1994 | DE4223490A1 Two=stroke reciprocating piston engine - has neighbouring pistons with toothed racks, which are connected by shaft with gear, to form working unit |
| 01/04/1994 | US5275085 Control device for pneumatic cylinder |
| 12/15/1993 | CN1079534A Combined, direct conveying, secondary aeration internal-combustion engine, air compressor |
| 12/13/1993 | CA2081592A1 Low-impact air cylinder |
| 10/06/1993 | CN1076990A Opposed double-piston eccentric crank mechanism |
| 10/06/1993 | CN1076989A Co-wheel type eccentric crank mechanism |
| 09/08/1993 | CN1076006A 往复式旋转发动机 Reciprocating rotary engine |
| 08/26/1993 | DE4205663A1 Two-stroke IC engine - has stepped piston with sealing rings at both ends, for lubrication of piston, gudgeon pin, and cylinder wall |
| 07/29/1993 | DE4201569A1 Two=stroke opposed-:piston engine without crank drive. - is started by moving magnet or linear motor, and drives rotary shaft via controlled slip coupling. |
| 06/29/1993 | US5222425 Cyclic hydraulic actuator |
| 05/25/1993 | US5213067 Internal combustion engine |
| 04/29/1993 | WO1993008372A1 Internal combustion rotary piston engine |
| 04/08/1993 | DE4236066A1 Four=stroke double piston engine - has hydraulic valve control, parallel to cylinder liner |
| 03/18/1993 | WO1993005290A1 Internal combustion engine having opposed pistons |
| 03/09/1993 | US5191863 Rotary sleeve-valve internal combustion engine |
| 03/09/1993 | US5191825 Low-impact air cylinder |
| 02/23/1993 | US5188015 Automatically sequenced hydraulic cylinder mechanism |
| 12/30/1992 | CN1067482A Multipurpose pump for aeration and liquid suction |
| 12/23/1992 | CN1067295A Sleeve pump |
| 10/15/1992 | WO1992017693A1 Dual compression and dual expansion internal combustion engine and method therefor |
| 09/16/1992 | EP0503842A1 Internal combustion engines |
| 07/28/1992 | US5133306 Horizontally opposed internal combustion engine |
| 07/21/1992 | CA1305338C Mechanism used to transform the reciprocating motion of a piston in a rotary motion of a shaft |
| 07/01/1992 | CN2108810U Multipurpose pump for inflating and sucking liquid |
| 06/03/1992 | EP0305504B1 High pressure reciprocator components |
| 05/20/1992 | CN1061260A Crankless double-acting piston engine |
| 02/18/1992 | US5088385 Actuator apparatus with secondary seal motion |
| 01/28/1992 | US5083530 Internal combustion engine having opposed pistons |
| 01/08/1992 | EP0464201A1 Rotary sleeve valve-carrying internal combustion engine |
| 12/18/1991 | EP0246275B1 Thermally powered engine |
| 12/11/1991 | CN2090422U Piston type crankless two-strok ic engine |
| 11/20/1991 | CN2089071U Coaxial dual pistons push-pull air compressor |
| 10/22/1991 | US5058537 Optimized high pressure internal combustion engines |
| 10/22/1991 | US5058536 Variable-cycle reciprocating internal combustion engine |
| 10/15/1991 | US5056314 Internal combustion engine with compound air compression |
| 08/27/1991 | US5042441 Low emission combustion system for internal combustion engines |
| 07/31/1991 | CN2081900U Telescopic high-pressure inflator |
| 07/09/1991 | US5029559 Opposed piston engine having fuel inlet through rod controlled piston port |
| 06/26/1991 | EP0434116A1 A piston and cylinder arrangment, more especially for a reciprocator or a high pressure internal combustion engine |
| 06/26/1991 | CN2079663U Undirectional piston type internal-combustion engine |
| 05/15/1991 | CN2077041U 柱塞泵 Piston |
| 05/07/1991 | US5012769 Energy transfer unit having at least three adjacent piston members |
| 04/10/1991 | CN1050590A High pressure quick inflator |
| 03/20/1991 | CN2073476U Lower feedback type oiled-generator |
| 03/06/1991 | CN2072607U Portable dual-tube booster inflator |
| 08/23/1990 | DE3940027A1 Opposed piston two=stroke IC engine - uses supercharged air supply and fuel injection into cylinders |
| 08/02/1990 | DE3900800A1 Opposed-piston internal combustion engine |
| 06/28/1990 | DE3905574A1 Engine with a cylinder and two pistons displaceable therein |
| 05/02/1990 | CN1041808A 整体式动力压缩机 Integral power compressor |
| 04/24/1990 | US4920288 Piston engine with dynamic groove bearing internal to piston and isolated from compression space |
| 04/17/1990 | US4917066 Swing beam internal-combustion engines |
| 04/10/1990 | WO1990011432A1 Rotary sleeve valve-carrying internal combustion engine |
| 04/10/1990 | US4915019 Mechanism for transforming the reciprocal movement of a piston into a circular movement of a shaft |
| 02/28/1990 | EP0355237A1 O-type engine construction |
| 02/20/1990 | CA1266006A1 Unique engine construction |
| 01/17/1990 | EP0233905B1 Mechanism for transforming the alternating motion of a piston into a circular motion of a shaft |