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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 |
| 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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