LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling

Telephonic communications – Supervisory or control line signaling – Substation originated

Computer telephone system

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Computer telephony integrated network

Telephonic communications – Supervisory or control line signaling – Substation originated

Conditional autodialer

Telephonic communications – Supervisory or control line signaling – Substation originated

Conference call dialing

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Control circuit for an electrical telephone accessory

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Control circuit for voltage controlled attenuator for speakerpho

Telephonic communications – Supervisory or control line signaling – Substation originated

Control method of communication terminal the communication...

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Controllable telephone annunciator

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Coordinating telephones or adjuncts on the same loop

Telephonic communications – Supervisory or control line signaling – Substation originated

Cordless telephone apparatus

Telephonic communications – Supervisory or control line signaling – Signal receiver

CPE alert signal tone detector

Telephonic communications – Supervisory or control line signaling – Substation originated

Credit card which generates a DTMF tone

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

Crescendo telephone ringer

Telephonic communications – Supervisory or control line signaling – Signal receiver

Cross-frame dual tone multifrequency detector

Telephonic communications – Supervisory or control line signaling – Substation originated

CRT mass-distribution, preprogrammed automatic dialing mechanism

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Current mode ring trip detector

Telephonic communications – Supervisory or control line signaling – Substation originated

Current source and off-hook detector

Telephonic communications – Supervisory or control line signaling – Substation originated

Custom telephone

Telephonic communications – Supervisory or control line signaling – Substation originated

Cycle-modulating type of dual-tone multifrequency generator