US PATENT SUBCLASS 220 / 721
.~.~ Pressure or temperature compensating

Current as of: June, 1999
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220 /   HD   RECEPTACLES

694  DF  CONTAINER ATTACHMENT OR ADJUNCT {21}
720  DF  .~ Expanding or contracting portion or component {2}
721.~.~ Pressure or temperature compensating {1}
722  DF  .~.~.~> In holder separate from container

DEFINITION

Classification: 220/721

Pressure or temperature compensating:

(under subclass 720) Subject matter wherein the attachment structure varies in response to a change of pressure or temperature of the receptacle or contents.