That reminds me of something I've always wondered. Suppose a patent has claims 1 thru 5. Does an invention have to copy all of them, or only one of them, in order to fall in the scope of the patent? What if you come along with a product that does, say, 1, 2, and 3, but not 4 or 5? Have you infringed the patent? Basically I'm asking whether the implied boolean operator combining the claims is AND or OR.

I expect you'll say what lawyers always say, which is "it depends", but it's my question and I'm sticking with it :)