4. Telephonic communications
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Digital echo cancellation device

Telephonic communications – Echo cancellation or suppression
Reexamination Certificate

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Digital echo canceller comprising a double-talk detector

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent

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Digital echo suppressor

Telephonic communications – Echo cancellation or suppression
Patent

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Digital exchange system with function of displaying operation st

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of centralized switching system
Patent

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Digital exchanging apparatus and method of communication...

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing
Reexamination Certificate

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Digital facility simulator with CODEC emulation

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Digital gyrator

Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate

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Digital isolation apparatus and method

Telephonic communications – Subscriber line or transmission line interface – Power supply
Utility Patent

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Digital isolation system with data scrambling

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Digital isolation system with low power mode

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Digital key telephone connecting apparatus and method in a digit

Telephonic communications – Multi-line or key substation system with selective switching...
Patent

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Digital key telephone set and digital key telephone system

Telephonic communications – Multi-line or key substation system with selective switching...
Reexamination Certificate

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Digital key telephone system and extension terminal device...

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Reexamination Certificate

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Digital key telephone system and extension terminal device...

Telephonic communications – Multi-line or key substation system with selective switching...
Reexamination Certificate

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Digital key telephone system and extension terminal device...

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Reexamination Certificate

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Digital key telephone system and extension terminal device...

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

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Digital key telephone system and extension terminal device...

Telephonic communications – Multi-line or key substation system with selective switching...
Reexamination Certificate

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Digital key telephone system and extension terminal device...

Telephonic communications – Multi-line or key substation system with selective switching...
Reexamination Certificate

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Digital kick meter and graphical user interface (GUI)

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

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Digital line card for interfacing a remotely located digital tel

Telephonic communications – Subscriber line or transmission line interface
Patent

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