Optical smoke detector
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 9, 1980
Grant Date -
N/A
app pub date -
Jun 4, 1979
filing date -
Jun 4, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical smoke detector having a smoke sensing chamber comprising a point source of light mounted on the middle of a photodetector, the source of light transmitting in a forward direction and away from the photodetector and further having the point source of light located at the center of curvature of a spherical reflector. During normal standby periods when there are no smoke particles in the chamber to scatter the light, the light is transmitted to the spherical reflector and reflected back to the source without falling on the photodetector. In the presence of smoke the light is scattered and falls on the photodetector to indicate the presence of the smoke.
First Claim
Family
International Classification(s)
Cited Art Landscape
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