Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2007-07-03
2010-12-07
Bugg, George A (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C356S432000, C250S221000, C250S222200
Reexamination Certificate
active
07847700
ABSTRACT:
A system and method is provided for an improved sensor for detecting particles in air such as smoke particles from a fire. The detector includes a laser diode that generates a light beam that is spread by a lens to fill a specific area of the interior of a sensing chamber before entering into a light trap for extinction. The detector consequently has a better signal to noise ratio and therefore may be more sensitive than prior art detectors. The detector may also use a shorter wavelength laser to allow the detector to sense smaller particles than prior detectors and consequently provide faster response to flaming fires.
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Bugg George A
Labbees Edny
McAndrews Held & Malloy Ltd.
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