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Class Information
Number: 137/216.2
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 > Automatic valve in vent line
Description: Subject matter including an automatic valve in the vent line.

Patents under this class:

Patent Number Title Of Patent Date Issued
8127787 Siphon breaker Mar. 6, 2012
7543599 Siphon and backflow resistant valve Jun. 9, 2009
5983929 Air valve Nov. 16, 1999
5197510 Apparatus for checking back pressure Mar. 30, 1993
4991623 Automatic air valves for ducts Feb. 12, 1991
4962548 Valve assembly Oct. 16, 1990
4811753 Recreational vehicle drain vent Mar. 14, 1989
4637080 Air volume control Jan. 20, 1987
4545398 Venting device Oct. 8, 1985
4524795 Hydraulic device for the drainage of waste water Jun. 25, 1985
4232706 Automatic valve device for sanitation waste pipes Nov. 11, 1980
4212314 Waste water outlet sanitary plant comprising a siphon Jul. 15, 1980
4185654 Anti-siphoning device for venting drain lines Jan. 29, 1980

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