Variable reflectance mirror

  • US 5,282,077 A
  • Filed: 04/19/1993
  • Issued: 01/25/1994
  • Est. Priority Date: 03/31/1986
  • Status: Expired due to Term
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First Claim
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1. A variable reflectance mirror which comprises a single-compartment, self-erasing, solution-phase electrochromic device which comprises, as the medium of reversibly variable transmittance to light reflected by the mirror, a solution which comprises(A) a solvent;

  • (B) at least one cathodic electrochromic compound which, in a voltammogram done in the solvent at room temperature, displays at least two chemically reversible reduction waves, with the first of said reductions accompanied by an increase in molar extinction coefficient at at least one wavelength in the visible range;

    (C) at least one anodic electrochromic compound which, in a voltammogram done in the solvent at room temperature, displays at least two chemically reversible oxidation waves, with the first of said oxidations accompanied by an increase in molar extinction coefficient at at least one wavelength in the visible range; and

    (D) if all cathodic and anodic compounds in their zero-potential equilibrium states in the solution are not ionic, an inert current-carrying electrolyte.

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