LandOfFree - US Patents - Listing for Telephonic communications

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

Dual mode portable telephone which prevents power being applied

Telephonic communications – Including aid for handicapped user

Dual modern architecture to support the transfer of...

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

Dual network housing device

Telephonic communications – Subscriber line or transmission line interface

Dual personality analog port

Telephonic communications – Special services – Conferencing

Dual plane cross point switch architecture for a micro-PBX

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

Dual receiver apparatus for integrated paging and radiotelephone

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

Dual signal triggered message waiting notification system for in

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

Dual span monitoring system for maintenance shelf control

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

Dual system cellular cordless radiotelephone apparatus with sub-

Telephonic communications – Terminal – Housing or housing component

Dual telephone

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

Dual test mode network interface unit for remote testing of...

Telephonic communications – Supervisory or control line signaling – Signal receiver

Dual tone detector operable in the presence of speech or backgro

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

Dual tone multifrequency signal detection and identification met

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

Dual voltage, self-monitoring line circuit

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring

Dual-alerting paging system and monitoring of return call

Telephonic communications – Terminal – Housing or housing component

Dual-axes hinge part for hinged components

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

Dual-band modem and service

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

Dual-bandwidth cellular telephone

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

Dual-bandwidth cellular telephone