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

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Speakerphone with downfiring speaker and directional...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Speakerphone with event driven control circuit

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

Speech amplifier associated with an LED

Telephonic communications – Substation or terminal circuitry – Amplifying

Speech circuit configuration

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

Speech circuit controlling sidetone signal by background noise l

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

Speech circuit for subscriber telephone apparatus

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Speech communication apparatus

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Speech communication apparatus equipped with echo canceller

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

Speech control apparatus used in a folding telephone

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

Speech control in a telephone station

Telephonic communications – Substation or terminal circuitry – Hold circuit

Static discharge snubber circuit for silicon controlled rectifie

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

Subscriber circuit

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

Subscriber line driver with equalizer

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

Subscriber line interface circuit having an impedence synthesize

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

Subscriber line interface circuitry with current drivers for...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Subscriber telephone set with amplified loudspeaker reception wi

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Switch with plural rotors

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Switching control apparatus for intercom-telephone sets

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Switching device for power supply to additional accessories for