4. Telecommunications
  5. Carrier wave repeater or relay system
  6. Portable or mobile repeater

Charles Sanford

Inventor

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Electronic cancellation of ambient noise in telephone headset

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent

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High frequency spread spectrum communication system terminal

Pulse or digital communications – Repeaters – Testing
Patent

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Method and system for communicating with remote units in a commu

Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Patent

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Method and system for communicating with remote units in a...

Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Reexamination Certificate

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Noise-cancelling telephone handset

Telephonic communications – Terminal – Housing or housing component
Patent

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Profile ID: LFUS-PAI-P-405312

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