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Class Information
Number: 137/247.41
Name: Fluid handling > With liquid valves or liquid trap seals > Liquid seal in liquid flow line; flow liquid forms seal > U-seals
Description: Seals wherein theU-shaped passage comprises a U-bend of which one leg thereof is an inlet pipe and constitutes the downflow column and the other leg is distinct and externally spaced from the first leg and constitutes the upflow column.










Sub-classes under this class:

Class Number Class Name Patents
137/247.45 Enlarged upflow leg 11
137/247.49 Even diameter legs 26
137/247.43 Topside access beneath cover plate closed floor opening 6


Patents under this class:

Patent Number Title Of Patent Date Issued
7806955 Gas-liquid separation system and method thereof Oct. 5, 2010
6845527 In-the-wall plumbing trap with integral waste and vent line Jan. 25, 2005
6779553 Emergency backflow system Aug. 24, 2004
6279601 Liquid zone seal Aug. 28, 2001
5878603 Quiet water fill system Mar. 9, 1999
5868011 Water traps for washing machines Feb. 9, 1999
5791401 Heat recovery device for showers Aug. 11, 1998
5638557 Sink trap with valuables capture vessel Jun. 17, 1997
5404597 Vacuum assist toilet trap Apr. 11, 1995
5379749 Condensate trap for multi-poise furnace Jan. 10, 1995
5375586 Condensate isolator and drainage system for furnace Dec. 27, 1994
5312205 Pipeline to reduce loss from breach May. 17, 1994
5309890 Dual-sided condensate trap for furnace May. 10, 1994
5241979 Structure of an elbow pipe Sep. 7, 1993
4728486 Pressurized water nuclear reactor pressure control system and method of operating same Mar. 1, 1988
4706701 Odor trap assembly Nov. 17, 1987
4612957 Vacuum pump and trap combination Sep. 23, 1986
4597404 Plumbing fixture Jul. 1, 1986
4516278 Flexible plumbing trap May. 14, 1985
4502500 Water traps Mar. 5, 1985
4480655 Liquid-plug-creating device Nov. 6, 1984
4467635 Leak detection in heat exchanger tubes and their tube sheet connections Aug. 28, 1984
4198717 Modular assembly for drain trap Apr. 22, 1980
4196596 Liquid trap for freeze-up protection on air cooled centrifugal chiller Apr. 8, 1980
4173800 Low-profile syphon trap Nov. 13, 1979
4164048 Combination sink trap access port filtration device Aug. 14, 1979
4092747 Odor trap for drain Jun. 6, 1978
3967324 Flexible trap for a waste line assembly Jul. 6, 1976
3954116 Sound-dampening connection May. 4, 1976
3935602 Traps for sinks, laundry tubs and the like Feb. 3, 1976











 
 
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