PHOTO-CHROMIC LIGHT DRAWING SETS
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United States of America Patent
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-
N/A
Issued Date -
Mar 15, 2007
app pub date -
Aug 21, 2006
filing date -
Aug 24, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In one embodiment of the invention, photo-chromic light drawing sets are disclosed including a photo-chromic page and a light pen. The photo-chromic page includes a flat transparent substrate having a page-like shape and one or more layers of photo-chromic ink applied onto the substrate. The flat transparent substrate to display an object underneath, and the one of more layers of photo-chromic ink are substantially transparent in an inactive state. The light pen selectively generates an activating light to shine onto the photo-chromic page and activate a portion of the one of more layers of photo-chromic ink. The activated portion of the one or more layers of photo-chromic ink is temporarily transformed from the inactive state to an active state in response to the activating light.
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