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Browse by Category: Main > Household
Class Information
Number: 4/211
Name: Baths, closets, sinks, and spittoons > Ventilation > House plumbing
Description: Systems of piping for apparatus relating to this class used in a house having ventilating structure combined therewith.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8640970 Air quality control system Feb. 4, 2014
8239973 Toilet ventilation apparatus Aug. 14, 2012
8151377 Odorless and overflow-less toilet system Apr. 10, 2012
7896976 Ventilation device for the discharge pipe of a water supply household appliance Mar. 1, 2011
6886592 Sewer relief valve with integral disinfectant means May. 3, 2005
6786815 Apparatus for venting rooms with exhaust fans Sep. 7, 2004
6684415 Ventilation apparatus Feb. 3, 2004
6474365 Overflow drain outlet cover system Nov. 5, 2002
6431972 Multiple plumbing vent apparatus Aug. 13, 2002
6092549 Device in a waste disposal system in a building Jul. 25, 2000
5645099 Sewer relief valve Jul. 8, 1997
5415438 Drainage vertical tube joint May. 16, 1995
5209257 Sewer relief valve May. 11, 1993
5048562 One way air admittance valve Sep. 17, 1991
5031659 Sewer line relief valve Jul. 16, 1991
5029606 Wall-mounted hook-up assemblies for washing machine and lavatory Jul. 9, 1991
5010600 Toilet odor removal system Apr. 30, 1991
4998754 Drainpipe joint Mar. 12, 1991
4991623 Automatic air valves for ducts Feb. 12, 1991
4974632 Automatic air valves for ducts Dec. 4, 1990
4962548 Valve assembly Oct. 16, 1990
4933995 Flush-operated bathroom fan Jun. 19, 1990
4919164 Method of installing piping, ducts and conduits in a prefabricated framed wall for a building structure and partition made thereby Apr. 24, 1990
4917147 Backwater escape valve Apr. 17, 1990
4867802 Air admittance valve for use in drainage systems Sep. 19, 1989
4860503 Plumbing apparatus Aug. 29, 1989
4850059 Apparatus for preventing backing up of sewage in a building Jul. 25, 1989
4839927 Drainage system in multi-story building Jun. 20, 1989
4811753 Recreational vehicle drain vent Mar. 14, 1989
RE32870 Sewer relief valve Feb. 21, 1989
4581780 Precast concrete toilet with vent Apr. 15, 1986
4551865 Ventilator for a lavatory pan Nov. 12, 1985
4494255 Ventilated toilet device Jan. 22, 1985
4493117 Continuously deodorized toilet Jan. 15, 1985
4480656 Plumbing fixture Nov. 6, 1984
4475571 Sewer relief valve Oct. 9, 1984
4449741 Waste plumbing installation and fittings therefor May. 22, 1984
4372087 Modular building structures Feb. 8, 1983
4323270 Pipe fitting device for plumbing systems Apr. 6, 1982
4261386 Sewer relief valve Apr. 14, 1981
4246664 Plumbing system and plumbing fittings for use therein Jan. 27, 1981
4191407 Pipe coupling for plumbing apparatus Mar. 4, 1980
4162546 Branch tail piece Jul. 31, 1979
4129906 Normally closed sewage venting system Dec. 19, 1978
4121914 Piping systems for drainage and piping members therefor Oct. 24, 1978
4073018 Internal back vent system Feb. 14, 1978
4038737 Method of replacing plumbing Aug. 2, 1977
3975780 Bathing facility incorporating bathroom air exhaust fans Aug. 24, 1976
3968815 Branch fittings for hydraulic stack apparatuses with gyrolaminary flow for use in buildings Jul. 13, 1976
3941151 Vent pipe check valve Mar. 2, 1976

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