H - Electricity – 01 – J
Patent
H - Electricity
01
J
358/21
H01J 47/02 (2006.01) G08B 17/10 (2006.01) G08B 17/113 (2006.01) H01J 41/08 (2006.01)
Patent
CA 1143871
ABSTRACT A smoke detector having an ionisation chamber with a central electrode which is covered by an insulator except at a restricted area closely spaced from a measuring electrode. A second electrode consisting of a perforated wall of the ionisation chamber. A conducting sleeve which is electrically connected to the second electrode surrounds the insulator on the first electrode, to minimize the effect of condensation of water on the first electrode.
325291
Johnson Dennis
Letts John B.
Chloride Group Limited
Fetherstonhaugh & Co.
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