Patent ID: 8147760

Claim:
A portable chemical oxygen generator comprising: a housing enclosing a reaction chamber comprising a first compartment containing an oxygen generating composition comprising a hydrogen peroxide adduct and a temperature stabilizing material formulated into controlled-release tablets and a second sealed compartment containing a catalyst dispersed in an aqueous solution; activation means attached to the housing for opening the second sealed compartment and for immersing the controlled-release tablets in the aqueous solution; a dual membrane filter comprising a first membrane made of a gas permeable and hydrophobic material with a Bendtsen Air Permeability of at least 300 mL/min and a Hydrostatic Head of at least 30 cm H 2 O, said first membrane letting oxygen and water and hydrogen peroxide vapors pass through while retaining the oxygen generating composition and the aqueous solution and a second membrane made of a hydrophilic superabsorbent material impregnated with catalyst particles at a loading greater than 5 g/m 2 , said second membrane letting oxygen through while decomposing and absorbing residual hydrogen peroxide vapor.