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Class Information
Number: 417/523
Name: Pumps > Expansible chamber type > Plural pumping chambers > Including valved piston
Description: Apparatus in which at least one of the chambers is defined in part by a piston, said piston or element rigid therewith (e.g., piston rod) having a pump fluid conducting passage formed therein and the means for controlling fluid flow into or out of the chamber including a movable valve member in flow controlling relationship with said passage, said valve member being located within or carried by said piston or element rigid therewith.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7614251 |
Reciprocating compressor and refrigerator having the same |
Nov. 10, 2009 |
| 7604064 |
Multi-stage, multi-phase unitized linear liquid entrained-phase transfer apparatus |
Oct. 20, 2009 |
| 7566206 |
Linear compressor for multi-stage compression |
Jul. 28, 2009 |
| 7390173 |
Well fluid pumping arrangement |
Jun. 24, 2008 |
| 7029241 |
Circumferential piston compressor/pump/engine (CPC/CPP/CPE); circumferential piston machines |
Apr. 18, 2006 |
| 6832900 |
Piston mounting and balancing system |
Dec. 21, 2004 |
| 6817846 |
Gas compressor and method with improved valve assemblies |
Nov. 16, 2004 |
| 6814548 |
Multiple piston engine with vibration reducing properties |
Nov. 9, 2004 |
| 6764287 |
Pump provided with diaphragms |
Jul. 20, 2004 |
| 6702556 |
Multi-cylinder compression pump |
Mar. 9, 2004 |
| 6655935 |
Gas compressor comprising a double acting piston, an elongate chamber, multiple inlets mounted within heads on both sides of the chamber, and one central outlet |
Dec. 2, 2003 |
| 6634867 |
Shuttle piston assembly with dynamic valve |
Oct. 21, 2003 |
| 6190142 |
Manual air pumps having selectable high pressure and high pressure modes |
Feb. 20, 2001 |
| 6155806 |
Dual acting piston pump having reduced back flow between strokes |
Dec. 5, 2000 |
| 6093003 |
Piston pump |
Jul. 25, 2000 |
| 6071096 |
Pneumatic cylinder, in particular for actuating fume extraction valves in fume and heat extraction plants |
Jun. 6, 2000 |
| 6030185 |
Radial piston pump |
Feb. 29, 2000 |
| 5980222 |
Hermetic reciprocating compressor having a housing divided into a low pressure portion and a high pressure portion |
Nov. 9, 1999 |
| 5975864 |
Pump with self-reciprocating pistons |
Nov. 2, 1999 |
| 5816787 |
Motion conversion rotator apparatus and method |
Oct. 6, 1998 |
| 5727930 |
Valves and rod assembly |
Mar. 17, 1998 |
| 5651302 |
Actuator pump |
Jul. 29, 1997 |
| 5628625 |
High pressure fluid pump for use in vehicular braking system having anti-lock and traction assist feature |
May. 13, 1997 |
| 5494410 |
Manually operable vacuum pump |
Feb. 27, 1996 |
| 5370504 |
Ambulant reciprocating compressor having plural pressure collection chambers |
Dec. 6, 1994 |
| 5213482 |
Hydraulic radial-type piston pump |
May. 25, 1993 |
| 5141413 |
Gas compressor having a variable-volume clearance pocket, and means for varying a clearance pocket in a gas compressor |
Aug. 25, 1992 |
| 5100305 |
Reciprocating piston pump |
Mar. 31, 1992 |
| 4842492 |
Compressor discharge muffler having cover plate |
Jun. 27, 1989 |
| 4755112 |
Water/air pumping system |
Jul. 5, 1988 |
| 4473340 |
Combined fluid pressure actuated fuel and oil pump |
Sep. 25, 1984 |
| 4443162 |
Fluid pump |
Apr. 17, 1984 |
| 4115041 |
Pumps |
Sep. 19, 1978 |
| 4084923 |
Double-acting, downhole pump assembly |
Apr. 18, 1978 |
| 4026468 |
Headlamp cleaning assembly |
May. 31, 1977 |
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