US PATENT SUBCLASS 220 / 202
.~ With condition responsive vent or valve

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
202.~ With condition responsive vent or valve {1}
203.01  DF  .~.~> Responsive to pressure {10}

DEFINITION

Classification: 220/202

(under subclass 200) Device comprising means responsive to a condition or change of condition, to effect the control of a vent or valve on a closure.

SEE OR SEARCH CLASS

137, Fluid Handling,

455+, for valves responsive to a change in line condition.