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Half duplex device and signal processing method thereof

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

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Half-duplex controller

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

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Half-duplex or full-duplex automode operation for use in data co

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

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Half-duplex speakerphone

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

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Hand adaptive telephone

Telephonic communications – Terminal – Housing or housing component
Patent

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Hand free telephone picking up device

Telephonic communications – Terminal – Housing or housing component
Reexamination Certificate

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Hand set

Telephonic communications – Terminal – Housing or housing component
Patent

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Hand test set with strain relief wire channel

Telephonic communications – Terminal – Housing or housing component
Patent

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Hand-held pay station telephone dispenser and cord retractor

Telephonic communications – Terminal accessory or auxiliary equipment – Support or stand
Patent

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Hand-held pay telephone and holder

Telephonic communications – With check operated control – Other than coin
Patent

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Hand-held portable telephone holder

Telephonic communications – Terminal accessory or auxiliary equipment – Attachable to terminal housing
Patent

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Hand-held radiotelephone with video transmission and display

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

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Hand-held telecommunication loop testing device

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Reexamination Certificate

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Hand-held telephone line signaling test instrument

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set
Patent

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Handheld device for dialing of phone numbers extracted from...

Telephonic communications – Audio message storage – retrieval – or synthesis – Voice message synthesis
Reexamination Certificate

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Handheld electronic device having improved phone call log,...

Telephonic communications – Supervisory or control line signaling – Substation originated
Reexamination Certificate

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Handheld electronic device with reconfigurable keypad

Telephonic communications – Terminal – Housing or housing component
Reexamination Certificate

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Handheld electronic device with reconfigurable keypad

Telephonic communications – Terminal – Housing or housing component
Reexamination Certificate

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Handheld facsimile and alphanumeric message transceiver operatin

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

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Handicap telephone with associated booth

Telephonic communications – With check operated control – At terminal station
Patent

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