4. Telecommunications
  5. Audience survey or program distribution use accounting

John D. Fourdraine

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Apparatus and method for automatically monitoring broadcast band

Telecommunications – Audience survey or program distribution use accounting
Patent

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Method and apparatus for determining when a telephone handset is

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

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Modem ringing supression circuit

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent

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Profile ID: LFUS-PAI-P-674882

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