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

Personal ring tone message indicator

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

Personalized telephone announcement

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

Personalized telephone signaling circuitry and device, and metho

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

Portable telephone set and method for inputting said...

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