US PATENT SUBCLASS 200 / 515
.~.~ Pressure equalizing means

Current as of: June, 1999
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200 /   HD   ELECTRICITY: CIRCUIT MAKERS AND BREAKERS

502  DF  SOLID CONTACT {15}
512  DF  .~ Membrane type {5}
515.~.~ Pressure equalizing means

DEFINITION

Classification: 200/515

Pressure equalizing means:

(under subclass 512) Subject matter including means to vent a compartment formed between the flexible member and the substrate, to either the atmosphere or to another compartment so as to equalize the pressure of air or other fluid displaced by the flexible sheet member when actuated.