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Class Information
Number: 137/247.11
Name: Fluid handling > With liquid valves or liquid trap seals > Liquid seal in liquid flow line; flow liquid forms seal
Description: Apparatus comprising a U-shaped flow passage which retains a portion of a line flow liquid to provide a gas seal in the said line.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7120949 |
Multi-purpose drain |
Oct. 17, 2006 |
| 6589440 |
Waterless urinal with liquid seal, liquid seal and method of using liquid seal |
Jul. 8, 2003 |
| 6543470 |
Flexible trap for drains |
Apr. 8, 2003 |
| 6250331 |
Zero crack-pressure, high-flow valve |
Jun. 26, 2001 |
| 5176165 |
Air gap apparatus |
Jan. 5, 1993 |
| 5028320 |
Sewer catch basin with gas seal for a petroleum refinery or chemical processing plant |
Jul. 2, 1991 |
| 4953235 |
Trap fitting assembly |
Sep. 4, 1990 |
| 4831875 |
Water trap valve for fail safe operation of an air inleakage monitoring system in a steam turbine |
May. 23, 1989 |
| 4706701 |
Odor trap assembly |
Nov. 17, 1987 |
| 4524795 |
Hydraulic device for the drainage of waste water |
Jun. 25, 1985 |
| 4432384 |
Sewer fluid trap |
Feb. 21, 1984 |
| 4198717 |
Modular assembly for drain trap |
Apr. 22, 1980 |
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