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Backup battery power supply for microprocessor based telephones

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

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Backup power supply at subscriber terminal

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

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Balance network directional coupler system and method

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit
Reexamination Certificate

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Balanced heat coil protector

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Reexamination Certificate

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Balanced hybrid circuit

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit
Patent

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Balanced phase splitting circuit

Telephonic communications – Subscriber line or transmission line interface – Hybrid circuit
Patent

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Balancing resistor and thermistor network for telephone circuits

Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent

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Battery boosted dial memory

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

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Battery feed circuit

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

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Battery feed circuit

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

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Battery feed circuit for a pair of subscriber lines

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

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Battery feed circuit for a telephone system

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

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Battery feed circuit for supplying feed current to telephone set

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

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Battery feed for telephone line cards

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

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Battery switching in a telephone subscriber line interface circu

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

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Battery switching subscriber loop interface circuit

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

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Battery-feed circuit for exchange

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

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Biasing arrangement for optimizing DC feed characteristics...

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

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Bidirectional adaptive voice frequency repeater

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

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Bipolar pulse forming line

Telephonic communications – Subscriber line or transmission line interface – Network interface device
Reexamination Certificate

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