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| Number | Title | Issue Date |
| 8162632 | Fluid pump A pump is disclosed, having a pumping chamber in the rotor. The rotor is rotatable between first, second, third and fourth positions. When the rotor is in the first position, an inlet cam assembly displaces a piston to draw fluid into the pumping chamber via a first... | 04/24/2012 |
| 6672848 | Cruciform pump A cruciform pump comprises a casing, a positioning round disk in the casing; a driven rotary disk; and two sliding blocks. A center of the positioning round disk is arranged corresponding to a center of the casing, and has a cruciform sliding groove. The ... | 01/06/2004 |
| 4609128 | Volumetric measuring-dosing device for fluids The device permits dosing a secondary fluid in a principal fluid and comprises a body (1) in which is provided a passageway (20) for the circulation of the principal fluid and having an inlet orifice (22) and distribution orifices (23) for the fluid, whic... | 09/02/1986 |
| 4437816 | Variable volume positive displacement rotary pump A tubular cylinder block is mounted for rotation about its axis within a cylindrical bore of a pump housing. The pump housing has circumferentially spaced inlet and outlet ports opening radially to the bore. Right angle intersecting diametric passages ext... | 03/20/1984 |
| 4285642 | Pump piston cylinder assembly with exterior ring seals A two-stroke piston pump includes an external piston cylinder seal by providing a flexible sidewall portion of the cylinder and an elastic O-ring sized to squeeze the flexible sidewall against the surface of the piston. The piston and piston cylinder are ... | 08/25/1981 |
| 4160628 | Positive displacement machine A positive displacement machine has a housing bounding an elongated interior compartment, a flat displaceable part-circular element in said compartment subdividing the latter into a pressure chamber and a suction chamber and having a recess in a periphery... | 07/10/1979 |
| 4124488 | Water purification by reverse osmosis Apparatus for reverse osmosis purification of water or other fluid by passing the fluid under pressure across a membrane, through which membrane a part of the fluid passes in purified form, makes use of a piston or diaphragm pump in which the front face o... | 11/07/1978 |
| 4055106 | Variable output fluid pump/motor The present invention comprises a fluid pump motor unit and a controller unit which controls the output of the pump/motor irrespective of the speed of the power source driving the pump/motor unit. The pump/motor unit comprises a cylindrical housing within whic... | 10/25/1977 |
| 3945766 | Radial piston machine A radial piston pump wherein the crank pin of a crankshaft engages with arcuate shoes at inner ends of radially extending pistons which are reciprocable in discrete cylinders. The outer end of each cylinder normally bears against the convex sealing surfac... | 03/23/1976 |
