US PATENT SUBCLASS 137 / 216.2
.~.~.~ Automatic valve in vent line

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

215  DF  BACK FLOW PREVENTION BY VACUUM BREAKING (E.G., ANTI-SIPHON DEVICES) {1}
216  DF  .~ Air vent in liquid flow line {2}
216.1  DF  .~.~ With liquid seal in liquid flow line {1}
216.2.~.~.~ Automatic valve in vent line

DEFINITION

Classification: 137/216.2

(under subclass 216.1) Subject matter including an automatic valve in the vent line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

217, for valved vents without a liquid seal means.