Vacuum cleaner with dirt detection

  • US 5,608,944 A
  • Filed: 06/05/1995
  • Issued: 03/11/1997
  • Est. Priority Date: 06/05/1995
  • Status: Expired due to Term
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First Claim
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1. A vacuum cleaner having a dirt detecting circuit including:

  • a) an upper fill tube;

    b) a microphone mounted outside said fill tube but closely adjacent thereto;

    c) a dirt detecting circuit electrically connected to said microphone;

    d) said dirt collecting circuit including a switchable integrator circuit portion for providing sensitivity selection for said dirt detector circuit.

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