Gate monitoring system

Railway switches and signals – Electric automatic highway signals – mine doors – and gates

Reexamination Certificate

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Details

C246S12200A, C246S127000, C246S473100

Reexamination Certificate

active

08066230

ABSTRACT:
A monitoring system and method is provided for monitoring the lighting and the gate arm position at a railroad crossing.

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patent: 2005/0284987 (2005-12-01), Kande et al.
patent: 2006/0244595 (2006-11-01), Malone et al.
patent: 2009/0007661 (2009-01-01), Nasiri et al.
patent: 2009/0194642 (2009-08-01), Honeck et al.

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