×

Face mask with back-up smoke inhalation protection and method of operation

  • US 5,964,218 A
  • Filed: 05/28/1996
  • Issued: 10/12/1999
  • Est. Priority Date: 08/31/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. A self-contained breathing apparatus for smoke inhalation protection for emergency response personnel in imminently life-threatening situations and for encouraging its limited use to imminently life-threatening situations, said apparatus comprising:

  • a mask to be worn over the face of a fire fighter, and having a first port connected to a hose through which breathable air is supplied to the mask and having a second port;

    a personal air filtering device for smoke inhalation protection in imminent life-threatening situations upon depletion or failure of breathable air being supplied through the hose, said personal air filtering device comprising a canister having an inlet opening through which air enters and an outlet opening communicating with the second port of said mask, and a filter medium within said canister and through which air flows between the inlet opening and the outlet opening; and

    a first use-evidencing mechanism closing one of the inlet opening and the outlet opening of said canister, and operatively coupled to the one of said canister and said mask to indicate use of the personal air filtering device.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×