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Class Information
Number: 137/216.1
Name: Fluid handling > Back flow prevention by vacuum breaking (e.g., anti-siphon devices) > Air vent in liquid flow line > With liquid seal in liquid flow line
Description: Apparatus including a liquid seal means in the liquid flow line.

Sub-classes under this class:

Class Number Class Name Patents
137/216.2 Automatic valve in vent line 13

Patents under this class:

Patent Number Title Of Patent Date Issued
7465399 Filtered and unfiltered water ducting in sink fitting Dec. 16, 2008
6776183 Aircraft drain device Aug. 17, 2004
6510863 Dual inlet air gap Jan. 28, 2003
6453931 Combination dishwasher and reverse osmosis air gab body Sep. 24, 2002
6349731 Water inlet system for dishwasher Feb. 26, 2002
6189558 Universal port vacuum breaker adapted for mounting within the upper ends of standpipes of different sizes Feb. 20, 2001
6105599 Transporting water device Aug. 22, 2000
5915406 Air gap device for water softener system Jun. 29, 1999
5878603 Quiet water fill system Mar. 9, 1999
5860444 Air gap backflow prevention device Jan. 19, 1999
5713385 Air gap body for reverse osmosis system Feb. 3, 1998
5592964 Air gap anti-siphon System Jan. 14, 1997
5305778 Air gap apparatus Apr. 26, 1994
5176165 Air gap apparatus Jan. 5, 1993
5046529 Potable water storage system Sep. 10, 1991
4222405 Pressure vacuum breaker Sep. 16, 1980
4051859 Apparatus for draining fluid from a continuously evacuated space Oct. 4, 1977
4026317 Waterseal May. 31, 1977

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