US PATENT SUBCLASS 455 / 401-- .~ Including call signaling (e.g., ringing, off-hook, dialing)

US PATENT SUBCLASS 455 / 401
.~ Including call signaling (e.g., ringing, off-hook, dialing)

Current as of: June, 1999
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455 /	HD	TELECOMMUNICATIONS

400	DF	HAVING SINGLE-CHANNEL TELEPHONE CARRIER {2}
401		.~ Including call signaling (e.g., ringing, off-hook, dialing)

DEFINITION

Classification: 455/401

Including call signaling (e.g., ringing, off-hook, dialing):

(under subclass 400) Subject matter which performs a call related signaling operation distinct from voice information.

(1) Note. These signals are of predetermined frequency and perform the same functions as DC signals in a noncarrier telephone system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

567, for a radiotelephone call alerting.

SEE OR SEARCH CLASS

379, Telephonic Communications,

31, for testing of a call signaling arrangement and subclasses 164, 179+, 251+, 350+, and 418 for various telephone call signaling arrangements.