A - Human Necessities – 62 – B
Patent
A - Human Necessities
62
B
137/1.5
A62B 7/10 (2006.01) A62B 18/08 (2006.01)
Patent
CA 1158131
161,441 CAN/LRS Abstract Improvements in respirators and particularly in respirators containing visually observable indicator means for indicating the end of the service life of respirator cartridges for use in atmospheres containing hazardous vapors and/or gases are disclosed. In contrast to the prior art where indicator reliability may be reduced due to its incorporation in a localized pocket or in a window in the sorbent bed, the present invention utilizes a colorimetric indicator in sheet form which is positioned along the inner transparent sidewall of the respirator cartridge. This indicator reveals the remaining capacity of the entire sorbent bed rather than the condition of a small volume near the probe or window. In addition, the colorimetric indicators useful in the present invention undergo irreversible color changes when subjected to gases to be detected.
377413
Eian Gilbert L.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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