Title: Ionization smoke detector

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.

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Inventors: Sasaki, Koju (Tokyo, JA)
Kobayashi, Akihiro (Fujisawa, JA)

Application Number: 357071
Filing Date: 1973-05-03
Publication_date: 1976-01-27
Assignee: Nittan Company, Ltd. (Tokyo, JA)
Primary Class(es): 313/54 250/381, 340/629
Other Classes:
US Patent Ref:

2408051	Sep, 1946	Donelian	313/54.
2702898	Feb, 1955	Meili	340/237.
3460124	Aug, 1969	Smith et al.	340/237.
3514603	May, 1970	Klein	340/237.
3582646	Jun, 1971	Ponsar	313/54.

Other Refs:
Primary Examiner: Kaufman, Nathan
Assistant Examiner:
Attorney: Geoffrey, Jr.; Eugene E.