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Respiratory protective apparatus

  • US 5,577,496 A
  • Filed: 04/14/1994
  • Issued: 11/26/1996
  • Est. Priority Date: 04/14/1993
  • Status: Expired due to Term
First Claim
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1. A respiratory protective apparatus having a facepiece, a breathing hose, a powered filtering device, and a filter connected together to form an air flow path, the powered filtering device comprising a housing having at least one inlet and an outlet, a portable power supply, a variable speed pump located between the inlet and the outlet for pumping air therebetween, and a controller connected to the pump including means for storing data regarding a wearer'"'"'s past breathing pattern, predicting a wearer'"'"'s likely demand;

  • the controller further including means for controlling the speed of the pump responsive to data which includes a wearer'"'"'s past breathing pattern.

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