LandOfFree - US Patents - Listing for Telephonic communications

Telephonic communications – Special services – Call diversion

Control apparatus for switching station connections using a hold

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

Control circuit for an electrical telephone accessory

Telephonic communications – Transmission line conditioning – Interference suppression

Control circuit for automatic elimination of telephone line nois

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

Control circuit for causing cyclic application of sealing...

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

Control circuit for control of peripheral equipment of wireless

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Control circuit for mobile telephone with full duplex operation

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection

Control circuit for voltage controlled attenuator for speakerpho

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Control circuit having a direct current control loop for control

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

Control data transmission system for private branch exchange

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

Control device for a facsimile apparatus

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Control device for a hand-free alternate operating telephone set

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Control device for a hands-free telephone set

Telephonic communications – Private or single line system – Doorbell system

Control device for a lift

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

Control for supplying power to car audio and phone systems

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling

Control interface for computer supported telephony...

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling

Control interface for linking a computer supported telephony...

Telephonic communications – Echo cancellation or suppression

Control logic for echo canceller with double talk detector

Telephonic communications – Audio message storage – retrieval – or synthesis

Control method and appartus for a radio telephone system

Telephonic communications – Echo cancellation or suppression

Control method and device for echo canceller