The recent threads about patents and the "multigrade" thread got me thinking. How about a thread about patents. You just list the patent number, it's title or a short description, and maybe a couple words about why you found this patent interesting. And if possible, a link to it to make it easy to access. Most important, let's not get side-tracked with discussions about the content of the patent or it's usefulness, let's just build up a repository of patents that others can use to research and learn about photography. So no words - at least in the sense of a discussion. Just a simple listing of interesting patents. Thanks!