US PATENT SUBCLASS 379 / 375
.~.~.~ With electronic call sounder (e.g., tone "ringer")

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


379 /   HD   TELEPHONIC COMMUNICATIONS

350  DF  SUPERVISORY OR CONTROL LINE SIGNALLING {5}
372  DF  .~ Signal reception at substation {1}
373  DF  .~.~ Incoming call alerting (e.g., ringing) {3}
375.~.~.~ With electronic call sounder (e.g., tone "ringer")

DEFINITION

Classification: 379/375

With electronic call sounder (e.g., tone "ringer"):

(under subclass 373) Subject matter where an audible alerting signal is generated at a subscriber terminal by a circuit having at least one electronic device.