US PATENT SUBCLASS 137 / 217
.~.~ Valved

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}
217.~.~ Valved {1}
218  DF  .~.~.~> With co-acting valve in liquid flow path

DEFINITION

Classification: 137/217

(under subclass 216) Apparatus wherein the air vent is provided with a valve.

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216.2, for valved vents in a flow line of the instant type including a liquid seal.

526, for vacuum relief valves, per se.

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4, Baths, Closets, Sinks, and Spittoons, 426, for vented siphon bowls.