4. Electricity: measuring and testing
  5. Measuring, testing, or sensing electricity, per se
  6. Analysis of complex waves

David C. Nicholas

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Analog echo suppressor

Telephonic communications – Echo cancellation or suppression
Patent

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Communication system to facilitate airborne electronic attack

Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate

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Conferencing apparatus

Patent

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Digital echo suppressor

Telephonic communications – Echo cancellation or suppression
Patent

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Dual TDM switching apparatus

Multiplex communications – Wide area network – Packet switching
Patent

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Profile ID: LFUS-PAI-P-332630

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