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Electrochromic device

  • US 4,726,664 A
  • Filed: 03/24/1986
  • Issued: 02/23/1988
  • Est. Priority Date: 03/25/1985
  • Status: Expired due to Fees
First Claim
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1. An electrochromic device comprising an oxidation coloring substance coloring in an oxidized state and a reduction coloring substance coloring in a reduced state which are formed on the surfaces of a pair of electrodes, respectively, and an electrolyte held between the oxidation and reduction coloring substances, wherein the oxidation coloring substance is a double salt containing an iron hexacyanoferrate and the reduction coloring substance is a tungsten-oxalic acid compound.

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