LandOfFree - US Patents - Listing for Telephonic communications,Supervisory or control line signaling,Signal reception at substation

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

Portable telephone set with a vibrator having an automatic switc

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

Pre-ring caller identification apparatus and method and call scr

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

Programmable audio alert system and method

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

Programmable timer circuit for the signal generator of a communi

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

Progressive alert indications in a communication device

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

Pulsed volume control of a magnetic ringer

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

Remote telephone ringer controller

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

Remote telephone signaling circuitry and device

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

Ring code recorder

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

Ring control device

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

Ring detector

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

Ring discriminator

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

Ring filter for pots communication system

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

Ring generator

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

Ring tone detection for a telephone system

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

Ring tone visualizer

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

Ring trip circuit having a simple trip detecting circuit of a hi

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

Ring varying technique for a telephone

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

Ring-tone identification of urgent phone calls