LandOfFree - US Patents - Listing for Telephonic communications,Substation or terminal circuitry

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Hands-free communication unit having residual acoustic echo supp

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Hands-free device for use with a cellular telephone in a car to

Telephonic communications – Substation or terminal circuitry – Amplifying

Hands-free phone converter

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Hands-free telephone

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Hands-free telephone

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

Hands-free telephone set

Telephonic communications – Substation or terminal circuitry

Handset port interface including DC measurement and transmit...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Handset proximity muting

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Handsfree communication apparatus

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Handsfree radiotelephone having dynamic path attenuation control

Telephonic communications – Substation or terminal circuitry – Amplifying

Headset amplifier

Telephonic communications – Substation or terminal circuitry – Amplifying

Headset amplifier with automatic log on/log off detection

Telephonic communications – Substation or terminal circuitry – Amplifying

Headset amplifier with automatic log on/log off detection

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Headset interface

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Headset/hand-free operating mode selecting and switching...

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

Hierarchical menu screen interface for displaying and accessing

Telephonic communications – Substation or terminal circuitry – Impedance matching or line equalizing

High performance telephone instrument with combination pulse and

Telephonic communications – Substation or terminal circuitry – Visual signalling

High voltage message waiting circuit

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

High-frequency noise elimination for use in telephone systems