4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection

Wai-Hung Leung

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Circuit and method for detecting a tone signal

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate

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System and method for using RSSI to invoke features of a...

Telecommunications – Radiotelephone system – Out-of-range indication
Reexamination Certificate

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Systems and methods for an electronic hook switch for...

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

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Systems and methods for an electronic hook switch for...

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

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Profile ID: LFUS-PAI-P-2202163

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