An electrochromic window assembly is disclosed that includes a first substrate and a second substrate that is maintained in a parallel and spaced relation from the first substrate by means of a window frame and spacer. The window assembly further includes an electrochromic device mounted within the airtight...http://www.google.es/patents/US6407847?utm_source=gb-gplus-sharePatente US6407847 - Electrochromic medium having a color stability
