Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-11-29
1987-07-14
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
250573, 250574, 338 17, 356338, G08B 1710
Patent
active
046805761
ABSTRACT:
An improved photoelectric smoke detector and alarm system which may be incorporated in a single station, completely self-contained unitary structure, or which may be incorporated in a multi-station detector system that is capable of self-contained operation but which can also be interconnected with other detectors whereby when any one detector's alarm sounds, all of the other alarms automatically sound in the other interconnected structures, the improved smoke detector and alarm system including a piezoceramic electrically activatable alarm, an illuminating circuit including a gallium aluminum arsenide light emitting diode, and a smoke sensing circuit including a pair of identical photoelectric cells formed on the same substrate with the photoelectric cells mounted in proximity to the light emitting diode whereby light emanating from the light emitting diode impinges upon one of the dual photoelectric cells at all times and impinges upon the other of the dual photoelectric cells to change the conductivity of the other photoelectric cell when particulate matter is present in the ambient atmosphere. An oscillator is included in the circuit which is actuatable in response to a differential in the conductivity of the photocells for actuating the piezoceramic alarm.
REFERENCES:
patent: 2407838 (1946-09-01), Kliever
patent: 2466696 (1949-04-01), Friswold et al.
patent: 3188593 (1965-06-01), Vasel et al.
patent: 3733595 (1973-05-01), Benedict
patent: 3810696 (1974-05-01), Hutchins, Jr.
patent: 3922655 (1975-11-01), Lecuyer
patent: 4053785 (1977-10-01), Lee et al.
patent: 4232307 (1980-11-01), Marsocci
patent: 4282519 (1981-08-01), Haglund et al.
patent: 4325058 (1982-04-01), Wagner et al.
patent: 4333093 (1982-06-01), Raber et al.
patent: 4414558 (1983-11-01), Nishizawa et al.
Gentex Corporation
McKinnon Malcolm R.
Myer Daniel
Rowland James L.
LandOfFree
Photoelectric smoke detector and alarm system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photoelectric smoke detector and alarm system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoelectric smoke detector and alarm system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1430070