US PATENT SUBCLASS 340 / 825.45
.~.~.~ Distress signal alarm

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

825  DF  SELECTIVE {23}
825.36  DF  .~ Having indication or alarm (e.g., location indication) {4}
825.44  DF  .~.~ Code responsive (e.g., paging) {4}
825.45.~.~.~ Distress signal alarm

DEFINITION

Classification: 340/825.45

Distress signal alarm:

(under subclass 825.44) Subject matter responsive to the receipt of signals having standardized characteristics from any transmitter.

(1) Note. The signals are often indications of nautical vessels in distress, such as the "SOS" or standard international distress signal.