US PATENT SUBCLASS 220 / 271
.~.~.~.~.~ Provided with vent

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
260  DF  .~ With closure opening arrangements for means (e.g., opening devices) {5}
265  DF  .~.~ Frangible member or portion {2}
266  DF  .~.~.~ About line or point of weakness {4}
270  DF  .~.~.~.~ With gripping means (e.g., pull tab) {4}
271.~.~.~.~.~ Provided with vent

DEFINITION

Classification: 220/271

(under subclass 270) Device having a vent which is opened when the pull tab or gripping means is pulled.

SEE OR SEARCH THIS CLASS, SUBCLASS:

231, for closures provided with a vacuum breaker or manually operable vent; and 366 for specific vent means in a closure.

SEE OR SEARCH CLASS

215, Bottles and Jars,

307+, for bottle and jar closures having vents therein.