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D4 channel bank with multi-mode formatted, performance-monitorin

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent

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DAA hook switch

Telephonic communications – Substation or terminal circuitry – Hold circuit
Reexamination Certificate

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DAC architecture for analog echo cancellation

Telephonic communications – Echo cancellation or suppression – Residual echo cancellation
Reexamination Certificate

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Dat storage back-up and modem apparatus

Telephonic communications – Audio message storage – retrieval – or synthesis – Multilingual system or operation
Patent

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Data access arrangement

Telephonic communications – Subscriber line or transmission line interface
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Data access arrangement

Telephonic communications – Subscriber line or transmission line interface
Patent

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Data access arrangement for detecting the hook status of an...

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

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Data access arrangement having combined remote hang-up/ring dete

Telephonic communications – Subscriber line or transmission line interface
Patent

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Data access arrangement utilizing a serialized digital data...

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
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Data access arrangement utilizing a serialized digital data...

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

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Data access arrangement utilizing a serialized digital data...

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

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Data access arrangement with telephone interface

Telephonic communications – Subscriber line or transmission line interface
Patent

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Data access method for subscriber location information

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
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Data acquisition and error correcting speech recognition system

Telephonic communications – Audio message storage – retrieval – or synthesis – Voice activation or recognition
Patent

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Data adapter for a radiotelephone

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
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Data and speech transmission device

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

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Data and telephone wiring terminal

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

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Data and voice transmission using composite cables and punch-dow

Telephonic communications – Substation or terminal circuitry – Wire distribution
Patent

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Data base accessing system

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
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Data calls using both constant bit rate and variable bit...

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Reexamination Certificate

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