LandOfFree - US Patents - Listing for Telephonic communications

Telephonic communications – Subscriber line or transmission line interface – Network interface device

Digital switching system with shared analog line

Telephonic communications – Subscriber line or transmission line interface – Network interface device

Digital switching system with shared analog line

Telephonic communications – Centralized switching system – Structure of equipment

Digital system connect frame

Telephonic communications – Centralized switching system – Structure of equipment

Digital system connect frame

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

Digital telecommunications exchange system

Telephonic communications – Audio message storage – retrieval – or synthesis

Digital telephone answering device and method of testing message

Telephonic communications – Audio message storage – retrieval – or synthesis – Multilingual system or operation

Digital telephone answering set

Telephonic communications – Substation or terminal circuitry – Conversion of signal form

Digital telephone control interface system

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

Digital telephone data and control signal transmission system

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line

Digital telephone link margin verification

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

Digital telephone overcoming international incompatibilities

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

Digital telephone set

Telephonic communications – Substation or terminal circuitry – Conversion of signal form

Digital telephone set capable of being simultaneously used by a

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

Digital telephone set having an emergency switching function and

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

Digital telephone station line controller

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

Digital telephone switch

Telephonic communications – Subscriber line or transmission line interface

Digital telephone system noise reduction circuit

Telephonic communications – Audio message storage – retrieval – or synthesis – Call source identification

Digital telephone system with automatic routing based upon...

Telephonic communications – Audio message storage – retrieval – or synthesis – Interacting voice message systems

Digital telephone system with automatic voice mail redirection