Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2007-05-01
2007-05-01
Paschall, Mark (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S213000, C219S497000, C219S501000, C116S202000, C340S581000
Reexamination Certificate
active
11281597
ABSTRACT:
A circuit is disclosed for detecting and eliminating the buildup of snow and/or ice on the viewable face of an LED traffic signal lens. The circuit measures the ambient temperature within the LED signal, and when the temperature falls to a level where snow and/or ice accumulation can occur, the circuit begins looking for snow and/or ice buildup on the lens of the LED signal. An infrared LED transmits a signal which is reflected when snow or ice is present on the lens of the traffic signal. When the reflected signal is received by an infrared receiver, it sends a signal to a microcontroller, which analyzes the signal to determine if it is a valid signal. If it is, a heater is turned on until the ice and snow are removed.
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Canan Steven M.
Smith David L.
Paschall Mark
Precision Solar Controls Inc.
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