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Class Information
Number: 417/258
Name: Pumps > Successive stages > Reciprocating rigid stages > Reciprocating cylinder and piston
Description: Apparatus in which one of the pumping members comprises a piston which reciprocates in a fixed cylinder and another pumping member comprises a cylinder which moves with respect to a fixed piston encompassed thereby.

Patents under this class:

Patent Number Title Of Patent Date Issued
8657588 Compression apparatus Feb. 25, 2014
8167591 High pressure air pump with reciprocating drive May. 1, 2012
8147215 Reciprocating-piston compressor having non-contact gap seal Apr. 3, 2012
8047818 High pressure, multiple-stage air pump with valve body inlet port arrangement Nov. 1, 2011
7794660 Fluid content monitor Sep. 14, 2010
7674343 Method of manufacturing double-glazing, and spacer forming device used for the manufacturing method Mar. 9, 2010
7566206 Linear compressor for multi-stage compression Jul. 28, 2009
6702556 Multi-cylinder compression pump Mar. 9, 2004
6145311 Pneumo-hydraulic converter for energy storage Nov. 14, 2000
5885061 Pneumatic pump Mar. 23, 1999
5507626 Telescopic pump Apr. 16, 1996
5437542 Positive displacement pump system Aug. 1, 1995
4334833 Four-stage gas compressor Jun. 15, 1982
4239460 Cryogenic pump for liquid gases Dec. 16, 1980
4047845 Cyclic pump Sep. 13, 1977
4038961 Pneumatic rifle and hand gun Aug. 2, 1977

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