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Class Information
Number: 417/545
Name: Pumps > Expansible chamber type > Valved piston
Description: Apparatus in which the pumping chamber 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 includes 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 |
| 7621727 |
Automobile compressor piston |
Nov. 24, 2009 |
| 7600563 |
Dual cylinder lift pump system and method |
Oct. 13, 2009 |
| 7491040 |
Compact compressor |
Feb. 17, 2009 |
| 7490674 |
Dual cylinder lift pump and method of recovering fluids from subsurface formations |
Feb. 17, 2009 |
| 7381035 |
Piston pump with check shaft |
Jun. 3, 2008 |
| 7351044 |
Multi-stage piston type compressor |
Apr. 1, 2008 |
| 7322804 |
Metering pump device for a vehicle heater |
Jan. 29, 2008 |
| 7278476 |
Retrievable stress and torque reducing tool |
Oct. 9, 2007 |
| 7165951 |
High-pressure generating device |
Jan. 23, 2007 |
| 7147442 |
Automatic oil pump, with a valved pumping piston and a valved driving piston unit |
Dec. 12, 2006 |
| 7063520 |
Suction valve assembly of reciprocating compressor |
Jun. 20, 2006 |
| 6986651 |
Pump priming apparatus |
Jan. 17, 2006 |
| 6913450 |
Suction valve coupling structure for reciprocating compressor |
Jul. 5, 2005 |
| 6840747 |
Positive-displacement oil pump |
Jan. 11, 2005 |
| 6817846 |
Gas compressor and method with improved valve assemblies |
Nov. 16, 2004 |
| 6793471 |
Fluid machine |
Sep. 21, 2004 |
| 6779986 |
Radial piston pump |
Aug. 24, 2004 |
| 6773240 |
Single piston dual chamber fuel pump |
Aug. 10, 2004 |
| 6746221 |
Traveling valve for sucker rod pumps |
Jun. 8, 2004 |
| 6676388 |
Gas compression apparatus for reciprocating compressor |
Jan. 13, 2004 |
| 6666663 |
Gas suction apparatus for a reciprocating compressor with a piston inertia valve |
Dec. 23, 2003 |
| 6648612 |
Oil-free air compressor |
Nov. 18, 2003 |
| 6644943 |
Reciprocating compressor with a linear motor |
Nov. 11, 2003 |
| 6634867 |
Shuttle piston assembly with dynamic valve |
Oct. 21, 2003 |
| 6616426 |
Airlift piston mechanism |
Sep. 9, 2003 |
| 6602060 |
Compressor employing piston-ring check valves |
Aug. 5, 2003 |
| 6599107 |
Piston pump having housing with a pump housing and a pump assembly drive housing formed therein |
Jul. 29, 2003 |
| 6585500 |
Valve fastening structure of a reciprocating compressor utilizing permanent magnets |
Jul. 1, 2003 |
| 6582203 |
Radial piston pump |
Jun. 24, 2003 |
| 6568925 |
Abrasive liquid pump apparatus and method |
May. 27, 2003 |
| 6551079 |
Ink-jet recording apparatus and parts thereof |
Apr. 22, 2003 |
| 6537040 |
Radial piston pump |
Mar. 25, 2003 |
| 6530760 |
Air compressor |
Mar. 11, 2003 |
| 6499974 |
Piston pump |
Dec. 31, 2002 |
| 6457957 |
Radial piston pump for generating high fuel pressure |
Oct. 1, 2002 |
| 6435846 |
Piston pump having housing with a pump housing and a pump assembly drive housing formed therein |
Aug. 20, 2002 |
| 6358026 |
Piston-carried suction valve in a reciprocating compressor |
Mar. 19, 2002 |
| 6318977 |
Reciprocating compressor with auxiliary port |
Nov. 20, 2001 |
| 6315533 |
Vibratory pump apparatus |
Nov. 13, 2001 |
| 6220835 |
Portion control dispensing pump |
Apr. 24, 2001 |
| 6206663 |
Piston pump |
Mar. 27, 2001 |
| 6193482 |
Structure of a piston of an air-filing device |
Feb. 27, 2001 |
| 6193476 |
11/2 Piston force pump |
Feb. 27, 2001 |
| 6173928 |
Stabilizer for inflation pump for inflatable balls and the like |
Jan. 16, 2001 |
| 6168399 |
Shot piston for molten plastic material |
Jan. 2, 2001 |
| 6132180 |
Automatic pumping apparatus utilizing wave motion |
Oct. 17, 2000 |
| 6123408 |
Ink-jet type image forming apparatus and an ink suction pump used therein |
Sep. 26, 2000 |
| 6120266 |
Piston mechanism with a flow passage through the piston |
Sep. 19, 2000 |
| 6068052 |
No tap tool for downhole reciprocating pumps |
May. 30, 2000 |
| 6015270 |
Linear compressor or pump with integral motor |
Jan. 18, 2000 |
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