Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2008-06-24
2008-06-24
Goins, Davetta W. (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S660000, C340S664000, C340S815450, C315S224000, C315S308000, C324S523000, C345S082000
Reexamination Certificate
active
07391335
ABSTRACT:
A system (10) and method for monitoring the operational life and/or performance of one or more light-emitting diodes (LEDs) (20) based on sensed parameters are disclosed. The remaining life of each LED may be predicted by counting the clock cycles during which the LED-based light is activated. LED current and/or temperature measurements may be used to control the clock signal and, thus, to compensate the predicted life value. Furthermore, operational characteristics of the LED-based light may be monitored based on LED current and/or voltage measurements. Such characteristics may include performance (e.g., intensity) and failure conditions (e.g., open or short circuits).
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Kirkpatrick Terence D.
Machi Nicolo F.
Mubaslat Saed M.
Black Lowe and Graham PLLC
Goins Davetta W.
Honeywell International , Inc.
Lai Anne v.
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