COMPARTMENTED ELECTROCHROMIC DEVICE

  • US 3,453,038 A
  • Filed: 06/15/1966
  • Issued: 07/01/1969
  • Est. Priority Date: 06/15/1966
  • Status: Expired due to Term
First Claim
Patent Images

1. AN ELECTROCHROMIC DEVICE COMPRISING:

  • (A) A CELL WITH TWO FACING AREA ELECTRODES, AT LEAST ONE OF WHICH IS TRANSPARENT AND CONSTITUTES A WINDOW OF THE CELL;

    (B) A PERMSELECTIVE MEMBRANE DIVIDING THE CELL OF SAID (A) INTO A FIRST COMPARTMENT INCLUDING THE TRANSPARENT ELECTRODE AND A SECOND COMPARTMENT INCLUDING THE OTHER ELECTRODE;

    (C) MEANS FOR (1) APPLYING A POTENTIAL ACROSS SAID ELECTRODES AND (2) REVERSING THEIR POLARITY;

    (D) AN ELECTROLYTICALLY CONDICTIVE FIRST COMPARTMENT MATRIX INCLUDING ELECTROLYTE IONS AND AT LEAST ONE MEMBER OF A COLOR-GENERATING REDOX SYSTEM COMPRISING THE DIFFERENTLY COLORED SPECIES, RED1 AND OX1;

    (E) AN ELECTROLYTICALLY CONDUCTIVE SECOND COMPARTMENT MATRIX CONTAINING ELECTROLYTE IONS AND AT LEAST ONE MEMBER OF A SECOND REDOX SYSTEM COMPRISING THE SPECIES RED2 AND OX2;

    SUCH THAT THE TWO COMPARTMENTS TAKEN TOGETHER CONTAIN AT LEAST ONE REDOX PAIR, RED1/OX2 OR OX1/RED2;

    SAID DEVICE BEING FURTHER CHARACTERIZED IN THAT;

    (F) SAID MEMBRANCE IS PERMEABLE TO ELECTROLYTE IONS BUT NOT TO THE SAID REDOX SPECIES;

    (G) THE FIRST ELECTRODE, WHEN ANODIC, OXIDIZES RED1 TO OX1, WHILE THE SECOND ELECTRODE REDUCES OX2 TO RED2;

    (H) THE FIRST ELECTRODE, WHEN CATHODIC, REDUCES OX1 TO RED1;

    WHILE THE SECOND ELECTRODE, NOW ANODIC, OXIDIZES RED2 TO OX2;

    AND (1) RED1, THE OTHER MATRIX MATERIALS, AND THE MEMBRANE IN COMBINATION CONSTITUTE A FIRST COLOR AT THE TRANSPARENT ELECTRODE WHEN THAT ELECTRODE IS CATHODIC, AND OX1, THE OTHER MATRIX MATERIALS, AND THE MEMBRANCE CONSTITUTE A SECOND COLOR AT THE TRANSPARENT ELECTRODE WHEN THAT ELECTRODE IS ANODIC.

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