Emergency lighting
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United States of America Patent
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Jan 6, 2009
Grant Date -
May 3, 2007
app pub date -
Nov 2, 2006
filing date -
Nov 3, 2005
priority date (Note) -
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Abstract
Emergency lighting for an aircraft employs a photoluminescent substrate that is activated by exposure to light wherein the substrate has portions with different light emitting characteristics whereby, in the absence of activating light, a first substrate portion provides a higher light output than a second substrate portion for an initial period after which the second substrate portion provides a higher light output than the first substrate portion.
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