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Class Information
Number: 4/255.02
Name: Baths, closets, sinks, and spittoons > Obstruction remover > Piston
Description: Subject matter wherein the apparatus uses a piston in fluid communication with the obstruction to agitate the fluid to clean or clear the obstruction within or clear the obstruction from the drain pipe of the sink, bath or flush closet.

Sub-classes under this class:

Class Number Class Name Patents
4/255.03 With one way valve 13

Patents under this class:

Patent Number Title Of Patent Date Issued
7962974 Plunger system and method Jun. 21, 2011
7908681 Plungers and devices for storing plumbing tools Mar. 22, 2011
7340783 Compressed air drain opening device Mar. 11, 2008
7188377 Hand-operable pump Mar. 13, 2007
7073211 Hydraulic plumber's friend Jul. 11, 2006
7062799 Piston type drain clearing apparatus Jun. 20, 2006
6895606 Piston type drain clearing apparatus May. 24, 2005
6862753 Compressed air drain opening device Mar. 8, 2005
6789276 Compressed air drain opening device Sep. 14, 2004
6779202 Plunger appliance for toilets Aug. 24, 2004
6775856 Toilet bowl pump apparatus, and method of reducing the water level in a toilet bowl Aug. 17, 2004
RE38291 Plunger device and method of making and using the same thereof Oct. 28, 2003
6499151 Toilet bowl pump apparatus and method for reducing the water level in a toilet bowl Dec. 31, 2002
6484326 Compressed air drain opening device Nov. 26, 2002
6393625 Plumbing device for a basin drainage May. 28, 2002
5992697 Water squirting device Nov. 30, 1999
5940897 Plunger Aug. 24, 1999
5927957 Plunger device and method of making and using the same thereof Jul. 27, 1999
5522094 Water plunger for clearing clogged drains Jun. 4, 1996
5199114 Drain clearing device Apr. 6, 1993
4733414 Spring loaded drain cleaning device Mar. 29, 1988
4542543 Impact device Sep. 24, 1985
4186451 Plastic sanitary pump Feb. 5, 1980
4137578 Kitchen scoop and plunger Feb. 6, 1979
3934280 Drain-flushing device Jan. 27, 1976

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