Cartridge respirator with service life indicator

Details Cartridge respirator with service life indicator Cartridge respirator with service life indicator

1980-06-20

1982-04-27

Michell, Robert W.

Surgery

Respiratory method or device

Means for indicating improper condition of apparatus

73 23, 73 38, 55DIG33, 55DIG35, 55DIG34, A62B 710

Patent

active

043265146

ABSTRACT:
A visually observable means for indicating end of service life of hazardous vapor/gas respirator cartridges or canisters is disclosed. A colorimetric indicator in sheet form is positioned along the inner transparent sidewall of the respirator cartridge or canister.

REFERENCES:
patent: 1537519 (1925-05-01), Yablick
patent: 4155358 (1979-05-01), McAllister et al.
patent: 4265635 (1981-05-01), Kring
patent: 4269804 (1981-05-01), Kring

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