LandOfFree - US Patents - Listing for Telephonic communications

Telephonic communications – Special services – Anonymous party

Control method for station-to-station slave transmission

Telephonic communications – Supervisory or control line signaling – Substation originated

Control method of communication terminal the communication...

Telephonic communications – Emergency or alarm communications – Central office responsive to emergency call or alarm

Control of a calling party's telephone service features by a...

Telephonic communications – Audio message storage – retrieval – or synthesis – Voice activation or recognition

Control of access for telephone service providers using...

Telephonic communications – Centralized switching system – Call distribution to operator

Control of access to the call completion on busy link...

Reissue Patent

Telephonic communications – Centralized switching system – Call distribution to operator

Control of access to the call completion on busy link...

Telephonic communications – Special services – Service trigger

Control of call features provided to a subscriber by a hierarchi

Telephonic communications – Special services – Call diversion

Control of call forwarding by a target telephone

Telephonic communications – Echo cancellation or suppression – Disable or inhibit function

Control of echo cancellers in a telecommunication system

Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy

Control of electronic information delivery

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature

Control of incoming and outgoing calls in a key system

Telephonic communications – Centralized switching system – Call distribution to operator

Control of merchant application by system monitor in virtual...

Telephonic communications – Special services – Service trigger

Control of non-locally switched telecommunication services

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

Control of operating states of channel unit installed in perform

Telephonic communications – With usage measurement – Call charge metering or monitoring

Control of prepaid balance status notification

Telephonic communications – Repeater – With frequency discriminator or negative impedance element

Control of signal transmission

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling

Control of telecommunications networks

Telephonic communications – Centralized switching system – Call distribution to operator

Control of telemetry interface gateway during a voice call

Telephonic communications – Centralized switching system – Call distribution to operator

Control of telemetry interface gateway for a voice call