Heated rear window!?

[rfisch]

I was looking for some engine parts for my 65 and got side-tracked (as always) and started looking at seals for around my rear window. Every now and then I get a small leak, but anyways while looking I was thinking about having to take the rear window out and what else could be done at that time and thought... why don't they make a replacement rear window that has those little black wire defogger things built in, or even a stick on type thing that would be applied like tint would? Seems like it would be simple enough to install and wire up. I searched for such a thing when the idea hit me but didn't find anything. Does anyone know of such a product. Did I just invent something?