4. Telephonic communications
  5. Substation or terminal circuitry
  6. Visual signalling

Elaine C. He

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High voltage message waiting circuit

Telephonic communications – Substation or terminal circuitry – Visual signalling
Patent

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Low power line selection circuit for a telephone

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

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Method and apparatus for detecting data port usage

Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1644609

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