Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-03-03
1995-06-06
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340628, G03B 1710
Patent
active
054226295
ABSTRACT:
A silencable photoelectric-type detector includes a source of radiant energy and a detector. A generator circuit provides a sequence of pulses to energize the source. A biasing circuit biases the detector. The detector can be temporarily silenced, when in alarm, by reducing the energy level of the pulses or altering the bias point of the detector for a period of time. The period of time can be established by an RC circuit. The effect of the energy level reduction or the bias point alteration is to reduce the sensitivity level of the detector temporarily.
REFERENCES:
patent: 4101785 (1978-07-01), Malinowski
patent: 4313110 (1982-01-01), Subulak et al.
patent: 4321466 (1982-03-01), Mallory et al.
patent: 4477798 (1984-10-01), Saul et al.
patent: 4567477 (1986-01-01), Cormier
patent: 4792797 (1988-12-01), Tanguay et al.
patent: 4814748 (1989-03-01), Todd
patent: 4827244 (1989-05-01), Bellavia et al.
BRK Electronics, a Division of Pitway Corporation, Smoke Alarm Detector Model SA88, Schematic of CIrcuitry (1 p.).
Firenetics Inc., LIFESAVER.COPYRGT. Owner's Manual, Model 0906, Sep. 1986 ( 3 pages).
BRK Brands, Inc.
Hofsass Jeffery A.
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