| Patents for F01B 13 - Reciprocating-piston machines or engines with rotating cylinders in order to obtain the reciprocating-piston motion (1,025) |
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| 11/19/1992 | EP0513877A2 Improved rotary vee engine |
| 11/19/1992 | EP0513876A2 Rotary vee engine |
| 11/10/1992 | US5161378 Rotary internal combustion engine |
| 10/08/1992 | DE4210712A1 Rotationsmaschine Rotary machine |
| 10/01/1992 | DE4110042A1 Kolbenmotor Piston engine |
| 09/16/1992 | CN1018277B Hydraulic motor with constant-stress rolling track and radial spherical pistons |
| 09/03/1992 | WO1992014917A1 Radial piston engine |
| 08/27/1992 | DE4105960A1 Radial-piston motor |
| 08/12/1992 | CN1063530A 高效发动机 Efficient engines |
| 07/28/1992 | US5133305 Internal combustion engine having rotary engine body |
| 06/25/1992 | WO1992010677A1 A radial piston motor or pump |
| 06/25/1992 | WO1992010676A1 A radial piston motor or pump |
| 06/25/1992 | CA2098103A1 Radial piston motor or pump |
| 06/23/1992 | US5123394 Rotary reciprocating internal combustion engine |
| 06/23/1992 | US5123334 Pump or motor with secondary piston connected to guide member of a main piston |
| 06/11/1992 | DE4039372A1 Rotary cylinder IC engine - incorporates mechanism connecting piston to crank arm |
| 06/11/1992 | CA2098104A1 Radial piston motor or pump |
| 05/26/1992 | US5115831 Adaptive stepped compensator valve |
| 05/13/1992 | EP0446232A4 Rotary internal combustion engine |
| 04/16/1992 | DE4101839A1 Engine with rotary cylinder block - has cylinders in successive positions round axis of rotation |
| 04/01/1992 | EP0477256A1 Piston engine. |
| 02/25/1992 | US5090372 Rotary internal combustion engine |
| 02/25/1992 | US5090295 Radial piston engine |
| 02/04/1992 | US5085127 Cavitation resistant hydraulic cylinder block porting faces |
| 01/22/1992 | CN1015319B Method of overbalance pressure compensator and double-raw plunger radial plunger pump |
| 12/24/1991 | US5074195 Fixed swash plate for an axial piston machine |
| 11/28/1991 | DE4003338A1 Rotary reciprocating piston engine - has end housing covers rigidly connected each other and able to pivot around rotor shaft |
| 10/23/1991 | EP0357650B1 Internal combustion engine |
| 10/17/1991 | DE4010865A1 Reciprocating rotary IC engine - has wedge-shaped radially moving pistons activated by expanding gaseous fluid in wedge-shaped chamber in engine housing |
| 10/08/1991 | US5054371 Radial pump/motor |
| 09/18/1991 | EP0446232A1 Rotary internal combustion engine |
| 08/28/1991 | EP0443816A2 Expander band for hydrostatic transmission |
| 08/28/1991 | CN1054115A Low speed large torque hydraulic motor |
| 08/22/1991 | DE4004932A1 Radial fluid pressure motor - has cam and roller operated pistons with piston ring at piston base carrying turning moment |
| 08/14/1991 | CN1013507B Radial-piston engine |
| 07/18/1991 | DE4000742A1 Rotary-stroke piston motor - has star-shaped element and uses movable guide track for element |
| 07/03/1991 | CN1052718A Centrifugal machinery stop working sealing device |
| 06/12/1991 | CN1052172A Hydraulic motor with constant-stress rolling track and radial spherical pistons |
| 05/29/1991 | DE3938793A1 Piston engine |
| 05/28/1991 | US5018435 Fluid cell arrangement for compressed air motors |
| 05/23/1991 | DE4003337C1 Rotary piston IC engine - has injection nozzles pivoting in housing wall inlets and directed toward piston surface |
| 05/16/1991 | WO1991006752A1 Internal combustion engine |
| 05/02/1991 | DE4003573A1 Rotary engine with cylindrical housing - has pistons in rotor joined to slide block by connecting rod |
| 05/02/1991 | DE4003572A1 Rotary stroke piston engine - incorporates connecting chamber to minimise harmful emissions |
| 05/02/1991 | DE4003571A1 Rotary stroke piston engine - incorporates housing wall made up of displaceable segments |
| 04/04/1991 | DE3932179A1 Piston engine |
| 03/27/1991 | CN1050248A Compensation method of overbalance pressure and double row plunger radial plunger pump |
| 03/27/1991 | CN1012211B Hydraulic energy exchanger |
| 01/16/1991 | CN1048584A Fluid cell arrangement for compressed air motors |
| 01/09/1991 | EP0406478A1 Power cell arrangement for pressurized-air motors |
| 01/08/1991 | US4982566 Expander band for hydrostatic transmission |
| 01/05/1991 | CA2018077A1 Fluid cell arrangement for compressed air motors |
| 01/01/1991 | CN1015281B Centrifugal machinery stop working sealing device |
| 12/27/1990 | WO1990015918A1 Piston engine |
| 12/20/1990 | DE3919609A1 Crank drive for star formation engine - has piston rod journals arranged in common plate of rotation about same axis |
| 12/13/1990 | DE3919168A1 Piston engine assembly - has pistons, crankshaft and rotating cylinder block with crankshaft axis having equal eccentricity to both other axes |
| 12/13/1990 | DE3918814A1 Gear motor using compressed pneumatic medium - has gear pair in sealed housing, each gear having two axially moving gear rings |
| 12/06/1990 | DE4012807A1 Rotational system for engine - has piston pairs arranged in cylinders of rotors arranged in cylinders around central rotational cylinder |
| 12/04/1990 | US4974553 Rotary internal combustion engine |
| 10/31/1990 | EP0394763A1 Internal combustion engine |
| 10/10/1990 | EP0391866A1 Fluid motor with rotary movement |
| 10/02/1990 | US4960034 Fluid-driven multi-cylinder operating unit tire removal machines |
| 09/13/1990 | DE3907307A1 Rotary centrifugal-piston engine, particularly a combustion engine |
| 09/12/1990 | EP0386738A2 Variable displacement pump or motor and neutral centering mechanism therefor |
| 09/04/1990 | US4953524 Radial piston engine |
| 08/28/1990 | US4951618 Rotary engine |
| 07/19/1990 | DE3901241A1 Hydraulic spiral motor |
| 06/26/1990 | US4936111 Crossed piston compressor with vernier offset port means |
| 06/19/1990 | US4934252 Variable displacement pump or motor and neutral centering mechanism therefor |
| 06/14/1990 | WO1990006424A1 Rotary internal combustion engine |
| 05/31/1990 | CA2003491A1 Rotary internal combustion engine |
| 05/22/1990 | US4926803 Radial-piston engine |
| 04/10/1990 | US4915596 Pure rotary positive displacement device |
| 04/10/1990 | US4915016 Hydromechanical control system for a power drive unit |
| 03/28/1990 | CN1040850A Plunger-rotating type engine |
| 03/21/1990 | CN2054842U Radiation type multi-shaft rotor compressor |
| 03/14/1990 | EP0357650A1 Internal combustion engine. |
| 02/28/1990 | EP0204837B1 Swashplate centring device |
| 02/27/1990 | US4903792 Hydraulic motors and vehicle hydrostatic transmission system of wheel motor type |
| 02/21/1990 | CN1006921B Rotary piston engine |
| 01/18/1990 | DE3822109A1 Hydraulic spiral motor |
| 01/03/1990 | EP0348485A1 Pump or motor with at least one piston body provided in a cylindrical housing. |
| 12/27/1989 | CN1038331A Wave-ring type rotary-piston engine |
| 11/15/1989 | CN1037188A Parallel rotary internal combustion engine |
| 11/08/1989 | CN1005742B Rotary fluid pressure device having free-wheeling capability |
| 11/02/1989 | WO1989010468A1 Piston machine |
| 09/26/1989 | CA1261711A1 Hydraulic displacements unit and method of assembly thereof |
| 09/19/1989 | US4867107 Rotary vee engine |
| 09/19/1989 | US4867042 Casing and cover for fluid energy converter |
| 09/12/1989 | US4864916 Radial pump/motor |
| 08/09/1989 | EP0327352A2 Rotary vee engine |
| 08/09/1989 | CN1034604A Radial-piston engine |
| 07/13/1989 | WO1989006303A1 Pump or motor with at least one piston body provided in a cylindrical housing |
| 06/07/1989 | EP0318967A2 Radial piston engine |
| 04/26/1989 | EP0204835B1 Hydraulic swashplate unit with unitary bearing retainer |
| 03/21/1989 | US4813340 Rotary fluid energy translating device |
| 03/02/1989 | DE3825864A1 Drehende kolben-versetzungseinrichtung Rotating-piston device dislocation |
| 03/02/1989 | DE3730558A1 Rotary internal combustion engine with stroke limiting |
| 02/08/1989 | EP0239581B1 Hydraulic displacement unit and method of assembly thereof |
| 01/31/1989 | US4800800 Fluid pressure translating device |