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| Number | Title | Issue Date |
| 6293765 | Tandem fixed displacement pump with torque control A tandem fixed displacement pump circuit with torque control includes first and second pumps that draw fluid from a reservoir to supply respective load circuits, pressure relief valves for each of the load circuits, and a pilot operated sequence valve tha... | 09/25/2001 |
| 5482445 | Free-piston engine having a slidable ring for moving the piston A free piston engine having a fluid pressure unit which includes a cylinder and a piston arranged within the cylinder and reciprocating therein between the bottom dead center and the top dead center. The piston includes a plunger-shaped piston extension c... | 01/09/1996 |
| 4413486 | Rotating cylinder external combustion engine A fluid pressure device of the type having reciprocating pistons disposed in associated cylinders formed in an engine block that rotates conjointly with a drive shaft mounted eccentrically to the spin axis of the engine block. The length of the piston str... | 11/08/1983 |
| 4382748 | Opposed piston type free piston engine pump unit A free piston engine pump (FPEP) converts combustion energy into hydraulic power in an efficient, controlled and relatively uncomplicated manner, for example, for vehicle propulsion, auxiliary system power, etc. The FPEP is substantially naturally mass ba... | 05/10/1983 |
| 4307999 | Free piston engine pump including variable energy rate and acceleration-deceleration controls In a free piston engine pump means are provided for obtaining a variable energy rate output and for controlling acceleration and deceleration of the piston masses. In particular a second high output work rate phase is obtained at the end of the power stro... | 12/29/1981 |
| 4297844 | Device for hydraulic control of thrust reversal for jet engine Device for hydraulic control of thrust reversal units activated by jacks in jet engine. The jacks are connected to a rotary hydraulic engine fed by a hydraulic circuit which involves a mechanism for slowing down the speed of the reversal units when they a... | 11/03/1981 |
| 4188788 | Hydraulic turbine system The hydraulic turbine system includes: an electric generator; rotary turbine blades; a hydraulic pump for operation by rotation of the turbine blades; a hydraulic motor for driving the generator; a hydraulic reservoir; and connections between the pump, the motor and the... | 02/19/1980 |
| 4087205 | Free-piston engine-pump unit A hybrid propulsion system, particularly for a vehicle, having a free piston type engine-pump unit connected to a working fluid circuit for controlling pressurization of a working fluid, which fluid in turn drives a hydraulic motor interconnected to the v... | 05/02/1978 |
