Brian A. Wittman

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Apparatus and method for detecting telephone line status

Telephonic communications – Multi-line or key substation system with selective switching... – Line status indication or call alerting
Patent

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Apparatus and method for extending battery life

Static information storage and retrieval – Powering – Conservation of power
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Digital-to-analog converter

Communications: electrical – Audible indication – Percussion-type sound producer
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Electronically-switched multifrequency generator with transducer

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Loudspeaking telephone station including directional microphone

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
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Profile ID: LFUS-PAI-P-650963

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