Ionization smoke detector

Details Ionization smoke detector Ionization smoke detector

1973-05-03

1976-01-27

Kaufman, Nathan

Electric lamp and discharge devices

With radioactive material

250381, 340237S, H01j 1732

Patent

active

039354920

ABSTRACT:
An ionization smoke detector having two ionization chambers with one of said chambers having an electrode at least partially surrounded by a conductive mesh constituting an intermediate electrode and the other of said chambers being formed between the intermediate electrode and an outer surrounding electrode of conductive mesh and a radioactive source carried by said outer electrode. The volume defined by the outer and intermediate electrodes is greater than the volume defined by the intermediate electrode.

REFERENCES:
patent: 2408051 (1946-09-01), Donelian
patent: 2702898 (1955-02-01), Meili
patent: 3460124 (1969-08-01), Smith et al.
patent: 3514603 (1970-05-01), Klein
patent: 3582646 (1971-06-01), Ponsar

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