US PATENT SUBCLASS 137 / 216.1
.~.~ With liquid seal in liquid flow 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.~.~ With liquid seal in liquid flow line {1}
216.2  DF  .~.~.~> Automatic valve in vent line

DEFINITION

Classification: 137/216.1

(under subclass 216) Apparatus including a liquid seal means in the liquid flow line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247+, for liquid seals.

SEE OR SEARCH CLASS

4, Baths, Closets, Sinks, and Spittoons,

211, 218 and 219 for ventilation of house plumbing or sewers.