Main electrodes 3, 4 are formed on the inner surface of a flexible insulating sheet 2 along opposed edges thereof, and junction electrode sections 3a, 4a are formed on the main electrodes at their central portions. Comb-toothed sub-electrodes 7, 8 extend from the main electrodes 3, 4 into...http://www.google.com/patents/US5716536?utm_source=gb-gplus-sharePatent US5716536 - Planar heating device for use with mirrors
