4. Telephonic communications
  5. Substation or terminal circuitry
  6. For loudspeaking terminal

David G. Lashley

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Full duplex telephone set using echo cancellation and side...

Telephonic communications – Echo cancellation or suppression
Reexamination Certificate

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Limiting maximum gain in duplex communications devices...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

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Microphone with reduced noise

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Housed microphone
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2958045

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