4. Telephonic communications
  5. Having light wave or ultrasonic link for speech or paging...
  6. Including fiber optic link within telephone network

James B. Piket

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Digital voice privacy apparatus and method

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent

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Double talk activity detector and method for an echo...

Telephonic communications – Echo cancellation or suppression – Disable or inhibit function
Reexamination Certificate

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Downlink activity and double talk probability detector and...

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

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Echo canceler circuit and method

Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate

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Full-duplex hands-free transparency circuit and method therefor

Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate

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Profile ID: LFUS-PAI-P-284748

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