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Class Information
Number: 4/219
Name: Baths, closets, sinks, and spittoons > Ventilation > Sewer
Description: Means for ventilating sewers.

Sub-classes under this class:

Class Number Class Name Patents
4/221 Burner 2
4/220 Disinfecting 3

Patents under this class:

Patent Number Title Of Patent Date Issued
8695123 Ventilated toilet Apr. 15, 2014
8239973 Toilet ventilation apparatus Aug. 14, 2012
8214930 Toilet odor removal apparatus Jul. 10, 2012
7730560 Odorless toilet Jun. 8, 2010
7685653 Odor extraction system with fluid tank valve Mar. 30, 2010
7655883 Heated plumbing vent Feb. 2, 2010
6928666 Toilet with self-contained ventilation system Aug. 16, 2005
6092549 Device in a waste disposal system in a building Jul. 25, 2000
5940894 Sanitizing protector for drainage pipes Aug. 24, 1999
5704074 Toilet gas suction vent Jan. 6, 1998
5645099 Sewer relief valve Jul. 8, 1997
5299326 Vehicle toilet vent apparatus Apr. 5, 1994
5209257 Sewer relief valve May. 11, 1993
4962548 Valve assembly Oct. 16, 1990
4850059 Apparatus for preventing backing up of sewage in a building Jul. 25, 1989
4524262 Electrically heated sewer vent line defroster Jun. 18, 1985
4129906 Normally closed sewage venting system Dec. 19, 1978

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