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Breathing apparatus

  • US 20050022817A1
  • Filed: 09/03/2004
  • Published: 02/03/2005
  • Est. Priority Date: 03/21/2003
  • Status: Active Grant
First Claim
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1. In a breathing apparatus of the type having a facemask, a source of breathable gas under pressure, a first conduit operatively leading from said source of breathable gas, a filter system comprising a filter and/or a decontamination medium, a second conduit operatively leading from said filter system, a blower adapted to move air under positive pressure through said filter system and into said second conduit, a third conduit operatively connecting said first and second conduits to said facemask, at least one valve operatively associated with said first and second conduits, adapted to control the flow of air from said filter system and pressurized gas from said source of breathable gas, such that breathable air is supplied to a user;

  • wherein the improvement comprises;

    a sensor adapted to determine whether air emerging from said filter system is safely breathable; and

    a signal generator operatively associated with said sensor, adapted to generate a signal indicative of whether said air emerging from said filter system is safely breathable.

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