Imperial Chemical Industries Limited

Michael John McDermott

John Graham Allen

Peter Gordon Wright

Keith Jones

An electrochromic medium and electrochromic devices containing such mediums comprising an electrochromically active material, an auxiliary redox system comprising reversibly oxidizable metallic ions, for example iron, a complexing agent for the metallic ions, particularly a carboxylic acid such as tartaric acid, and an inert solvent.

Electrochromic device and medium therefor

A device for the control of light transmission or reflection comprises one or more working electrodes, preferably arranged to form a display and having radiation transmission or reflection properties, an active material comprising an N(p-cyanophenyl) substituted derivative of a compound, usually bicyclic, having two conjugated nitrogen-containing rings in contact with the working electrode surface, a counter electrode, also in contact with the active material and ferrous ammonium sulphate as an auxiliary redox system.

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Runcorn, United Kingdom

Michael John McDermott