Respirator cartridge end-of-service lift indicator system and method of making
AssigneeAmerican Optical Corporation
InventorsJohn A. Jones, Adolfo V. Ayes
Life of this patent
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Abstract
Providing visual means for indicating when vapor/gas respirator cartridges have exhausted their capacity to provide respiratory protection at or below a hazardous concentration level. In combination with a vapor/gas indicator adapted to undergo a change in color with contact by an organic vapor or gas, there is provided a catalytic agent for enhancing activation and reaction of the indicator agent.
Claims6
In a respirator cartridge having a shell within which there is supported a gas/vapor sorbent and an indicator agent selected from the group consisting of sodium dichromate and potassium dichromate characterized to undergo a change in color concomitant with exposure to concentrations of organic vapors and gases which are below a threshold limit known to be safe to inhale, the improvement comprising:
- catalytic/oxidizing means for rendering a gas/vapor entering the cartridge and passing through said means more readily detected by said indicator agent than with non-use of said means, said catalytic/oxidizing means being located adjacent to an upstream of said indicator agent in said cartridge.
Dependencies are inferred from the claim text.