US PATENT SUBCLASS 340 / 693.7
.~.~.~ Inserted battery required for housing closure

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
693.5  DF  .~ Specified housing {3}
693.6  DF  .~.~ Configured to promote sensing capability (e.g., smoke detector) {1}
693.7.~.~.~ Inserted battery required for housing closure

DEFINITION

Classification: 340/693.7

Inserted battery required for housing closure:

(under subclass 693.6) Subject matter wherein the housing has structure preventing two or more housing portions from being properly fastened together unless the DC power supply for the electrical means providing the humanly perceptible signal is positioned in its proper place within the housing.