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

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Telephone with hands-free operation

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Telephone-computer interface

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

Telephones with talker sidetone

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Telephony device with compensation for line losses

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

Terminal apparatus having a function for preventing unnecessary

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

Terminal apparatus with a handset using a four pin connector

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Terminal for wirebound telecommunication

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

Terminal impedance setting circuit for a two-wire to four-wire c

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

Terminal station for telecommunication by wire

Telephonic communications – Substation or terminal circuitry – Amplifying

Time dependant, variable amplitude threshold output circuit for

Telephonic communications – Substation or terminal circuitry – Amplifying

Time dependent, variable amplitude threshold output circuit for

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Tone detection for integrated telecommunications processing

Telephonic communications – Substation or terminal circuitry

Tone, modulated tone, and saturated tone detection in a...

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

Transformer-coupled matching impedance

Telephonic communications – Substation or terminal circuitry – Amplifying

Transmit by-pass cable

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Transmit/receive arbitrator

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Transmitting message playback concurrent with speakerphone...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal

Two-module telephone terminal

Telephonic communications – Substation or terminal circuitry – Power control or detection circuit

Unbalanced slic with a built-in ring circuit