HIGH CONDUCTIVITY ELECTROLYTE GEL MATERIALS

• US 3,708,220 A
• Filed: 05/25/1970
• Issued: 01/02/1973
• Est. Priority Date: 05/25/1970
• Status: Expired due to Term

• Current Assignee: Marion Douglas Meyers, Thomas Anthony Augurt
• Original Assignee: Marion Douglas Meyers, Thomas Anthony Augurt
• Inventors: Meyers, Marion Douglas, Augurt, Thomas Anthony
• Primary Examiner(s): Wibert, Ronald L.
• Assistant Examiner(s): Rothenberg, J.
• Application Number:
  US05/041,155
• Time in Patent Office: 953 Days
• Field of Search: 350/160
• US Class Current: 359/275
• CPC Class Codes: G02F 1/1525 characterised by a particular ion transporting layer, e.g. electrolyte

Abstract

An electro-optical device is provided which is useful in control of visible and infrared absorption by windows, data display devices and the like typically comprising in sandwich arrangement a pair of electrodes, and disposed therebetween, two identical layers of transition metal electrochromic compounds separated by a semi-solid highly conductive sulfuric acid gel electrolyte. The gel exhibits good conductivity, stability and compatibility with the electrochromic layers.

Claims

2. A variable light transmission device, as in claim 1, which comprises a laminate of at least two layers of said persistent electrochromic material separated by a semi solid electrolyte gel disposed between said pair of conductive electrodes.

3. The device of claim 1 wherein said semi-solid electrolyte is a sulfuric acid-polyvinyl alcohol gel.

4. The device of claim 1 wherein said gel electrolyte has a conductance of at least that of 4M H2SO4.

5. The device of claim 2 wherein said gel is in face to face electrical contact with two separate but identical films of tungsten oxide.

6. The device of claim 2 wherein at least one of said electrodes is substantially transparent.

7. The device of claim 1 wherein said persistent electrochromic material is tungsten oxide.