Helmet-carried apparatus for detecting and signalling the presen

Details Helmet-carried apparatus for detecting and signalling the presen Helmet-carried apparatus for detecting and signalling the presen

1979-07-25

1981-04-21

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340321, 340331, 340366A, 340633, 340693, 362106, 422 96, G08B 1710, F21L 1514

Patent

active

042635888

ABSTRACT:
Apparatus for detecting and signalling the presence of a dangerous gas in an atmosphere comprising means for detecting the gas and means for signalling when the gas content exceeds a predetermined level. Said detecting means and said signalling means are disposed in a common housing and connecting by a double-wire cable to a separate supply.

REFERENCES:
patent: 1584276 (1926-05-01), Coulter
patent: 1757887 (1930-05-01), Wheat
patent: 3201771 (1965-08-01), Proulx
patent: 3309691 (1967-03-01), Bonanno
patent: 3676664 (1972-07-01), Corvetti
patent: 3788124 (1974-01-01), Teton
patent: 3815114 (1974-06-01), Johnson et al.
patent: 4090185 (1978-05-01), Patty
patent: 4090232 (1978-05-01), Golden
patent: 4146887 (1979-03-01), Magnante

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