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Class Information
Number: 417/487
Name: Pumps > Expansible chamber type > Plural pumping members in single pump chamber > Coaxial reciprocating pumping members
Description: Apparatus having at least two pumping members within said single chamber which are adapted for to-and-fro movement upon a common longitudinal axis.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7377406 |
Two stage grease gun |
May. 27, 2008 |
| 7353746 |
Two-stage hand pump |
Apr. 8, 2008 |
| 7337927 |
Two stage grease gun |
Mar. 4, 2008 |
| 7156626 |
Double side action type reciprocating compressor |
Jan. 2, 2007 |
| 6929064 |
Downhole pump |
Aug. 16, 2005 |
| 6705845 |
Device for the metered delivery of a viscous liquid |
Mar. 16, 2004 |
| 6358024 |
High capacity supply pump with simultaneous directly actuated plungers |
Mar. 19, 2002 |
| 6257849 |
Manual air pump having selectable high pressure and high pressure modes |
Jul. 10, 2001 |
| 6135733 |
Manual air pump having selectable high pressure and low pressure modes |
Oct. 24, 2000 |
| 6132189 |
Combined bicycle tire and air suspension pump with removable pressure gauge |
Oct. 17, 2000 |
| 6030194 |
Gerotor motor and improved valve drive and brake assembly therefor |
Feb. 29, 2000 |
| 5934889 |
Pump driven by cam having the cylinder supported by the cam shaft |
Aug. 10, 1999 |
| 5779457 |
Hand pump for pumping air of lower pressure and high pressure |
Jul. 14, 1998 |
| 5769616 |
Submerged pump with coaxial opposing pistons, driven by double lobed camshaft |
Jun. 23, 1998 |
| 5746584 |
Inner cam type fuel injection pump having modified plungers |
May. 5, 1998 |
| 5613839 |
Variable rate pump |
Mar. 25, 1997 |
| 5542827 |
Multiple nested pistons hand priming pump with spring biasing |
Aug. 6, 1996 |
| 5443370 |
Two cylinder manual air pump |
Aug. 22, 1995 |
| 5366904 |
Method of metering a fluid using a multi-mode differential fluid displacement pump |
Nov. 22, 1994 |
| 5013198 |
Air-hydraulic pump with auxiliary pumping means |
May. 7, 1991 |
| 4568250 |
Low power electromagnetic pump |
Feb. 4, 1986 |
| 4501246 |
Fuel injection pump |
Feb. 26, 1985 |
| 4486154 |
Fuel injection pump |
Dec. 4, 1984 |
| 4435133 |
Free piston engine pump with energy rate smoothing |
Mar. 6, 1984 |
| 4386889 |
Radial wave pump |
Jun. 7, 1983 |
| 3948589 |
Primer valve |
Apr. 6, 1976 |
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