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Class Information
Number: 137/216
Name: Fluid handling > Back flow prevention by vacuum breaking (e.g., anti-siphon devices) > Air vent in liquid flow line
Description: Apparatus wherein the back flow is prevented by an air vent or gap in the liquid flow line.










Sub-classes under this class:

Class Number Class Name Patents
137/217 Valved 62
137/216.1 With liquid seal in liquid flow line 18


Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8528596 Distributor with a rotatable U-shaped connecting channel Sep. 10, 2013
8528595 Distributor with a rotatable U-shaped connection channel Sep. 10, 2013
8267109 Water vacuum break assembly and method for selectively accommodating multiple control systems Sep. 18, 2012
8176930 Water supply apparatus for use in ice maker May. 15, 2012
8118053 Adjustable backflow prevention device Feb. 21, 2012
8100873 System and method for collecting exudates Jan. 24, 2012
7673648 Air gap with deodorizer apparatus and method of use Mar. 9, 2010
7543598 Vacuum break thermistor housing Jun. 9, 2009
7465399 Filtered and unfiltered water ducting in sink fitting Dec. 16, 2008
7387502 Method and apparatus for elimination of gases in pump feed/injection equipment Jun. 17, 2008
7357147 Modular air gap device and faucet including same Apr. 15, 2008
7353838 Top mounted faucet assembly with air gap Apr. 8, 2008
7290557 Drain line adapter air gap fitting Nov. 6, 2007
7213608 Wasted water draining valve for a drinking water fountain May. 8, 2007
7059341 Discharge ducts for pumping water from a supply reservoir to a delivery reservoir Jun. 13, 2006
7047998 Gravity flow drain extension for a condensation drain line May. 23, 2006
7017600 Faucet Mar. 28, 2006
7011106 Modular air gap device and faucet including same Mar. 14, 2006
6971400 Air gap apparatus Dec. 6, 2005
6776183 Aircraft drain device Aug. 17, 2004
6748966 Combination air gap for dish washer and soap dispenser Jun. 15, 2004
6510863 Dual inlet air gap Jan. 28, 2003
6499501 Conduit system for proximate flow of clean and waste water Dec. 31, 2002
6453931 Combination dishwasher and reverse osmosis air gab body Sep. 24, 2002
6435203 Apparatus and method for regenerating etchant solution containing metal compound Aug. 20, 2002
6427716 Positive displacement hydrant with water discharge path from reservoir Aug. 6, 2002
6279598 Mixing eductor Aug. 28, 2001
6269833 Spent fuel pool anti-siphon system Aug. 7, 2001
6189558 Universal port vacuum breaker adapted for mounting within the upper ends of standpipes of different sizes Feb. 20, 2001
6098651 Non-educting back flow prevention device Aug. 8, 2000
5934309 Collection assembly incorporating air-break design Aug. 10, 1999
5915406 Air gap device for water softener system Jun. 29, 1999
5881753 Passive fluid level controller Mar. 16, 1999
5875809 Accessory faucet for purified water in a dishwasher air gap system Mar. 2, 1999
5865209 Air gap adapter Feb. 2, 1999
5862829 Air gap eductor Jan. 26, 1999
5860444 Air gap backflow prevention device Jan. 19, 1999
5839474 Mix head eductor Nov. 24, 1998
5823430 Automatic fertilizing apparatus Oct. 20, 1998
5813702 Water softener drain adaptor system Sep. 29, 1998
5797420 Proportioner Aug. 25, 1998
5797419 Sewer line trap priming assembly and antisiphoning conduit component therefor Aug. 25, 1998
5782112 Auto-injection siphon break for washers Jul. 21, 1998
5713385 Air gap body for reverse osmosis system Feb. 3, 1998
5681459 Refect water drain line installation system and apparatus for under sink reverse osmosis filter system Oct. 28, 1997
5678592 Back flow prevention device Oct. 21, 1997
5673725 Air gap device with interchangeable parts Oct. 7, 1997
5635058 Reject water drain line installation system and apparatus for under sink reverse osmosis filter system Jun. 3, 1997
5592964 Air gap anti-siphon System Jan. 14, 1997
5535774 Apparatus for storing and supplying water for use in catering equipment Jul. 16, 1996

1 2 3










 
 
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