Respirator filter system
AssigneeMine Safety Appliances Company
InventorZane N. Frund
Life of this patent
Estimating the term…
Abstract
The present invention provides a respirator filter system suitable for filtering toxic agents, including organic vapors, acid gases, formaldehyde, ammonia, and methylamine as well as pesticides, CS and CN tear gases, dusts, mists, fumes and radionuclides from environmental air to be respired by a user of the filter system. In general, the filter system of the present invention includes a cartridge containing a layer of an unimpregnated activated carbon, a layer of an activated carbon impregnated with sulfate, molybdenum and at least one impregnate selected from the group consisting of copper and zinc, and a HEPA filter. Cartridges containing these adsorbents or adsorbents similar to them (in carbon tetrachloride activity and chemistry) have been discovered to be uniquely capable of filtering a broad range of toxic agents.
Claims6
A respirator cartridge for removing a broad range of toxic agents, including organic vapors, acid gases, formaldehyde, ammonia and methylamine, from gases to be breathed by a user of the respirator cartridge, the respirator cartridge comprising a layer of an adsorbing activated carbon, the respirator cartridge further comprising a layer of an adsorbing impregnated activated carbon, the impregnated activated carbon being impregnated with a sulfate compound, a molybdenum compound and at least one compound selected from the group consisting of a copper compound and a zinc compound, the layer of activated carbon comprising at least approximately 20 cc of the activated carbon, and the layer of the impregnated activated carbon comprising at least 80 cc of the impregnated activated carbon, the layer of activated carbon being positioned downstream from the layer of impregnated activated carbon with respect to the flow of gas through the respirator cartridge upon inhalation by the user thereof, the respirator cartridge having a fill volume of up to approximately 120 cc.
Dependencies are inferred from the claim text.