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Multiple area smoke detector system

  • US 20020080039A1
  • Filed: 12/26/2000
  • Published: 06/27/2002
  • Est. Priority Date: 08/01/2000
  • Status: Abandoned Application
First Claim
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1. ) Using an inverted DC voltage Pulse generated by a conventional design commercial smoke Detector (Ionization Chamber), when energize by the existence of smoke to trigger start a monostable 555 timer circuit, that generate an positive-going output voltage pulse designed for thirty seconds.

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