US PATENT SUBCLASS 220 / 89.1
.~ Pressure relief means

Current as of: June, 1999
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220 /   HD   RECEPTACLES

694  DF  CONTAINER ATTACHMENT OR ADJUNCT {21}
89.1.~ Pressure relief means {2}
89.2  DF  .~.~> Frangible pressure relief means {1}
89.4  DF  .~.~> Fusible pressure relief means

DEFINITION

Classification: 220/89.1

Pressure relief means:

(under subclass 85) Receptacle wherein the attachment includes means to relieve excess pressure (usually gas) within the container.

SEE OR SEARCH THIS CLASS, SUBCLASS:

203.01+, for a receptacle closure comprising a pressure responsive vent or valve.