LandOfFree - US Patents - Listing for Telephonic communications

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

Dual-limit current-limiting battery-feed circuit for a digital l

Telephonic communications – Call or terminal access alarm or control – At substation

Dual-line telephone bridging device that gives remote telephones

Telephonic communications – Terminal accessory or auxiliary equipment – With circuit connection to terminal

Dual-line telephone jack adapter and cable coupler

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Dual-mode speaker telephone

Telephonic communications – Terminal

Dual-purpose hardware aperture

Telephonic communications – Subscriber line or transmission line interface – Power supply

Dual-slope current battery-feed circuit

Telephonic communications – Telephone line or system combined with diverse electrical...

Dual-tone multi-frequency signal transfer protocol

Telephonic communications – Supervisory or control line signaling – Signal receiver

Dual-tone multifrequency (DTMF) signalling transparency for low-

Telephonic communications – Line equalization or impedance matching

Duplex communication coupler system

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Duplex hands-free communications circuit

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit

Duplex microphone communication system

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling

Duplex structure signal transfer point system for common channel

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Duplex transducer for simultaneous voice broadcast and reception

Telephonic communications – Terminal – Housing or housing component

Durable telephone with no moving parts

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling

DX circuit

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing

Dynamic adaptation to congestion in connection-oriented...

Telephonic communications – Centralized switching system – Switching apparatus for connecting calling line to...

Dynamic admission control for telecommunications relay service w

Telephonic communications – Subscriber line or transmission line interface

Dynamic allocation of overhead voltage to support...

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

Dynamic allocation of resources for echo cancellation