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Class Information
Number:
417/530
Name:
Pumps
>
Expansible chamber type
>
Plural pumping chambers
>
Including valved piston
> Including nonvalved piston
Description:
Apparatus in which the piston of at least one of the chambers is imperforate.
Patents under this class:
Patent Number
Title Of Patent
Date Issued
6935850
Axially aligned dual piston cylinder air pump with a common head portion
Aug. 30, 2005
6695595
Pump for pumping at two pressures
Feb. 24, 2004
5997256
Dual stage, dual mode air pump
Dec. 7, 1999
5832727
Hydraulic oil well pump drive system
Nov. 10, 1998
5522711
Precision metered multiple fluid pumping system
Jun. 4, 1996
5423662
Precision metered multiple fluid pumping system
Jun. 13, 1995
4775301
Oscillating electromagnetic pump with one-way diaphragm valves
Oct. 4, 1988
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