US PATENT SUBCLASS 340 / 313
.~ Answer back

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

286.01  DF  SYSTEMS {24}
313.~ Answer back {1}
314  DF  .~.~> Noncorrespondence alarm (e.g., if acknowledgement is incorrect)

DEFINITION

Classification: 340/313

(under subclass 286.02) Subject matter having means to send an interrogation from one station to another and having means to send the answer to said interrogation back from said second station to said first station.

SEE OR SEARCH THIS CLASS, SUBCLASS:

825.54+, for selective systems for automatically and selectively answering interrogations.