Color-stabilized electrochromic devices
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United States of America Patent
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Aug 13, 2002
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app pub date -
Aug 30, 2000
filing date -
Aug 19, 1999
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Abstract
An electrochromic device comprising: (a) at least one substantially transparent substrate having an electrically conductive material associated therewith; and (b) an electrochromic medium having a predetermined color while in a high transmission state, wherein the electrochromic medium comprises: (1) an anodic material and a cathodic material, wherein both of the anodic and cathodic materials are electroactive and at least one of the anodic and cathodic materials is electrochromic; (2) a redox buffer; and (3) means associated with the redox buffer for controllably maintaining the predetermined color of the electrochromic medium while in the high transmission state relative to an electrochromic medium without the redox buffer.
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