Patent ID: 9339669
Filing Date: 2016-05-17
CPC Classification: A61M,A62B,A63B

Claim Text:
1. A breathing apparatus, comprising: a mouthpiece; a canister removably attached to the mouthpiece, the canister defining a first opening in direct fluid communication with the atmosphere, a second opening in fluid communication with the mouthpiece, and a flowpath extending between the first and second openings, the flow path providing fluid communication between the mouthpiece and the atmosphere; first and second screens disposed in the flow path of the canister; and a porous material extending from the first screen to the second screen in the canister and for reacting with at least one product of a user's exhalation to generate heat and resistance, thereby providing sensations to the user that simulate the use of an actual self-contained self-rescuer device, the porous material being the only reactionary material contained within the canister, the porous material consisting of a single homogenous layer of non-hazardous material or comprising a hazardous material.