LandOfFree - US Patents - Listing for Telephonic communications

Telephonic communications – Telephone line or system combined with diverse electrical... – Remote indication over telephone line

Digital telephonic system for stethoscope signal processing

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of hybrid or echo suppressor or canceller

Digital telephony card for use in an operator system

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...

Digital text messaging system and method

Telephonic communications – Centralized switching system – With generating of call associated substation signal

Digital tone detector

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal

Digital tone detector

Telephonic communications – Supervisory or control line signaling – Substation originated

Digital tone generator

Telephonic communications – Supervisory or control line signaling – Substation originated

Digital tone generator

Telephonic communications – Multi-line or key substation system with selective switching... – With special service

Digital voice conferencing bridge

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network

Digital voice privacy apparatus and method

Telephonic communications – Repeater – With signal conversion

Digital voice transmission having improved echo suppression

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network

Digital wireless interface for a base station for establishing c

Telephonic communications – Centralized switching system – Switching controlled in response to called station...

Digital-cross-connect system single element restoration...

Telephonic communications – Audio message storage – retrieval – or synthesis

Digital/audio interactive communication network

Telephonic communications – Private or single line system – Having plural stations with selective calling

Digitally controlled intercommunications system

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

Digitally controlled ring signal generator

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

Digitally controlled ringer signal generation

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...

Direct access arrangement (DAA) circuit having automatic...

Telephonic communications – Line equalization or impedance matching

Direct access arrangement device

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal

Direct access test unit for central office