Color reversible light filter utilizing solid state electrochromic substances

Abstract

Abstract THE INVENTION PROVIDES A COLOR REVERSIBLE LIGHT FILTER SYSTEM UTILIZING SOLID STATE FILMS OF INORGANIC COMPOUNDS HAVING ELECTROCHROMIC PROPERTIES IN A MULTI-LAYER GLASS PANEL. THE GLASS PANEL CONSISTS OF TWO PANES OF SUBSTANTIALLY TRANSPARENT GLASS, WITH ONE PANE BEING COATED WITH A LAYER OF TIN OXIDE, AND A FILM OF SILVER CHLORIDE CONTAINING FREE SILVER, TO PROVIDE A COLORLESS ELECTRODE, THE OPPOSITE PANE BEING COATED WITH A LAYER OF TIN OXIDE AND A FILM OF TUNGSTIC ACID, OR PREFERABLY A MIXTURE OF TUNGSTIC AND MOLYBDIC ACID, TO PROVIDE A COLOR-REVERSIBLE ELECTRODE. A STABLE COLOR IS DEVELOPED IN THE GLASS PANEL BY APPLYING A DC ELECTRICAL POTENTIAL ACROSS THE ELECTRODES FOR ONLY A FEW MINUTES AND, WHEN DESIRED, THE PANEL CAN BE RENERED COLORLESS IN ABOUT THE SAME LENGTH OF TIME BY REVERSING THE POLARITY OF THE ELECTRODES. HAVING ELECTROCHROMIC PROPERTIES IN A MULTI-LAYER GLASS PANEL. THE GLASS PANEL CONSISTS OF TWO PANES OF SUBSTANTIALLY TRANSPARENT GLASS, WITH ONE PANE BEING COATED WITH A LAYER OF TIN OXIDE, AND AFILM OF SILVER CHLORIDE CONTAINING FREE SILVER, TO PROVIDE A COLORLESS ELECTRODE; THE OPPOSITE PANE BEING COATED WITH A LAYER OF TIN OXIDE AND A FILM OF TUNGSTIC ACID, OR PREFERABLY A MIXTURE OF TUNGSTIC AND MOLYDBIC ACID, TO PROVIDE A COLOR-REVERSIBLE ELECTRODE. A STABLE COLOR IS DEVELOPED IN THE GLASS PANEL BY APPLYING A DC ELECTRICAL POTENTIAL ACROSS THE ELECTRODES FOR ONLY A FEW MINUTES AND, WHEN DESIRED, THE PANEL CAN BE RENDERED COLORLESS IN ABOUT THE SAME LENGTH OF TIME BY REVERSING THE POLARITY OF THE ELECTRODES.

Inventors

• 👤 James A Mcintyre
• 👤 Robert D Hansen

Bibliographic Details