| Patents for F01L 25 - Drive, or adjustment during operation, of distribution or expansion valves by non-mechanical means (555) |
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| 02/21/1978 | US4074612 Fluid operated hydraulic pump |
| 02/21/1978 | US4074611 Fluid pressure actuator for producing rotational motion |
| 02/14/1978 | US4073350 Device for damping the recoil of a work tool connected to a percussion tool |
| 01/31/1978 | US4070949 Hydraulic striking apparatus |
| 01/17/1978 | US4068983 Piston pumps driven by fluid-actuated piston having a constant fluid force against the small area surface |
| 01/17/1978 | US4068468 Starting method and system for a gas turbine |
| 01/03/1978 | US4066002 Fluid pressure operated rotary stepper actuator |
| 12/27/1977 | US4065230 Reciprocating infusion pump and directional adapter set for use therewith |
| 12/13/1977 | US4062639 Fluid motor-driven pump using fluid pressure to set position of pilot valve |
| 12/13/1977 | US4062268 Fluid operable hammer |
| 09/27/1977 | US4050356 Apparatus for controlling a fluid medium |
| 08/16/1977 | US4042311 Pump fluid motor carrying spool valve for distributor valve actuation |
| 07/26/1977 | US4037992 Slurry continuous pressure-feeding apparatus |
| 07/26/1977 | US4037520 Fluid motor apparatus |
| 07/12/1977 | US4035109 Pump for fluent, and especially heavy and abrasive materials |
| 07/12/1977 | US4034817 Impact tool |
| 06/21/1977 | US4030857 Paint pump for airless spray guns |
| 06/14/1977 | US4029440 High pressure fluid intensifier and method |
| 06/14/1977 | US4028995 Hydraulic striking apparatus |
| 06/07/1977 | US4028014 Reversing means for double-acting fluid pump |
| 05/31/1977 | US4026193 Hydraulically driven hammer system |
| 05/10/1977 | US4022108 Hydraulically operated percussion device |
| 05/03/1977 | US4021156 High pressure hydraulic system |
| 05/03/1977 | US4021149 Fluid driven reciprocating pump |
| 05/03/1977 | US4020746 Hydraulically operable linear motor |
| 05/03/1977 | US4020744 Control of hydraulically powered equipment |
| 04/26/1977 | US4019838 Air pressure-actuated double-acting diaphragm pump with means to produce a selected start-up position |
| 03/22/1977 | US4012909 Hammer |
| 03/15/1977 | US4011795 Impact tool |
| 03/15/1977 | US4011723 Fluid power system |
| 02/08/1977 | US4006783 Hydraulic operated rock drilling apparatus |
| 02/08/1977 | US4006665 Percussion tool |
| 02/01/1977 | US4005637 Hydroacoustic apparatus and valving mechanisms for use therein |
| 01/25/1977 | US4004420 Hydropneumatic pumping arrangement |
| 11/30/1976 | US3994627 Pumping apparatus for wet concrete |
| 10/19/1976 | US3986355 Well head gas counter balanced and operated actuator for oil well pumps |
| 10/12/1976 | US3985470 Dual pressure hydraulic pump |
| 10/05/1976 | US3983788 Method to minimize the amount of oil in the air exhausted from a pneumatically operated impact motor and an impact motor for carrying out this method |
| 09/21/1976 | US3981622 Hydraulic intensifier control system |
| 09/21/1976 | US3981414 Beverage dispensing system |
| 08/24/1976 | US3976401 Pump for abrasive slurries and the like |
| 08/17/1976 | US3974885 Pneumatic percussive power tool |
| 07/27/1976 | US3971213 Pneumatic beam pumping unit |
| 07/20/1976 | US3969987 Hydroacoustic apparatus and valving mechanisms for use therein |
| 07/20/1976 | US3969984 Hydroacoustic apparatus and valving mechanisms for use therein |
| 06/15/1976 | US3963391 Method and apparatus for controlling speed and torque of hand held air driven vane type motors |
| 06/15/1976 | US3963383 Air driven pump |
| 05/25/1976 | US3958494 Multiple displacement hydraulic motor drive apparatus |
| 05/18/1976 | US3957400 Double-ended hydraulically actuated down-hole pump |
| 04/13/1976 | US3949644 Pneumatic-hydraulic pumping device |
| 03/23/1976 | US3945770 High pressure pump |
| 03/16/1976 | US3943823 Control system for double acting air motor |
| 02/03/1976 | US3935789 Reversing valve |
| 01/20/1976 | US3933175 Snifter valve useful in control means for a piston in a cylinder |
| 01/20/1976 | US3932990 Closed loop booster system pneumatic actuator for oil wells |