False alarm resistant and fast responding fire detector

Details False alarm resistant and fast responding fire detector False alarm resistant and fast responding fire detector

2010-10-08

2011-12-13

Wu, Daniel (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S501000, C340S517000, C340S521000, C340S522000, C340S523000, C340S526000, C340S578000, C340S579000, C340S628000, C340S630000

Reexamination Certificate

active

08077046

ABSTRACT:
A fire detector and method of using it generate a fire alarm through use of a smoke detector and a carbon monoxide detector once the smoke detector detects a threshold level of light obscuration for greater than a first pre-selected time period or a reduced threshold level of light obscuration for greater than a second pre-selected time period or the CO detector detects a rate of increase in CO concentration which exceeds a first preselected CO rate for a third pre-selected time period and the smoke detector detects the reduced threshold level of light obscuration or the rate of increase in CO concentration exceeds a second preselected CO rate for a fourth pre-selected time period. The fire detector and method can also use a carbon dioxide detector and generate the fire alarm when either a rate is of increase in concentration of CO2exceeds a first CO2predetermined rate for a fifth pre-selected time period and the smoke detector detects a reduced threshold level of light obscuration or the rate of increase in concentration of CO2exceeds a second CO2predetermined rate for a sixth pre-selected time period.

REFERENCES:
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patent: 5767776 (1998-06-01), Wong
patent: 5774038 (1998-06-01), Welch et al.
patent: 5912624 (1999-06-01), Howard, II
patent: 5945924 (1999-08-01), Marman et al.
patent: 5966077 (1999-10-01), Wong
patent: 6107925 (2000-08-01), Wong
patent: 6110038 (2000-08-01), Stern
patent: 6166647 (2000-12-01), Wong
patent: 7142105 (2006-11-01), Chen
patent: 7170418 (2007-01-01), Rose-Pehrsson et al.

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