Communications: electrical – Traffic control indicator – Traffic control or local controller failure indicator
Reexamination Certificate
2006-10-17
2006-10-17
Swarthout, Brent A. (Department: 2612)
Communications: electrical
Traffic control indicator
Traffic control or local controller failure indicator
C246S47300R, C340S641000, C340S907000
Reexamination Certificate
active
07123165
ABSTRACT:
An operational status detection system for a railroad warning device having a warning light, comprising: a photo detector configured to generate a signal corresponding to a light output of the warning light of the railroad warning device, the photo detector comprising a lens, an optical filter and a photodiode, wherein the optical filter is disposed between the photodiode and the lens and the optical filter is configured to provide the light output of the warning light to be presented as a substantially uniform spatial response to the photodiode wherein areas of high intensity of the warning light that are received by the lens are attenuated, the areas of high intensity providing higher light outputs than other areas of the warning light; and a microcontroller for receiving the signal, wherein the microcontroller compares the signal to at least one threshold value, the at least one threshold value corresponding to an acceptable light output of the warning light.
REFERENCES:
patent: 3551676 (1970-12-01), Runnels
patent: 5446277 (1995-08-01), Rutter
patent: 5778133 (1998-07-01), Plesko
patent: 6222446 (2001-04-01), Hilleary
patent: 6369704 (2002-04-01), Hilleary
patent: 6614358 (2003-09-01), Hutchison et al.
patent: 6642856 (2003-11-01), DeMarco et al.
patent: 6688561 (2004-02-01), Mollet et al.
patent: 6717526 (2004-04-01), Martineau et al.
patent: 2003/0122039 (2003-07-01), Mollet et al.
patent: 2004/0119587 (2004-06-01), Davenport et al.
patent: 2006/0001547 (2006-01-01), Davenport et al.
Texas Instruments, A Single-Supply OP-Amp Circuit Collection, Application Report SLOA058-Nov. 2000, by Bruce Cartr, pp. 1-26.
Illumination Fundamentals, Lighting Research Center, by Alma E.F. Taylor, 2000, pp. 1-46.
Davenport David Michael
Meyers Mark Marshall
Fletcher Yoder
Swarthout Brent A.
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