I once spent about four months going through several hundred patents of a competitor, finding a way to do a product that did not infringe. We more or less succeeded, but man it was painful. Had expert legal help (and permission of our corporate lawyers) -- don't go off on your own and read these things.
A few thoughts on patents:
- Don't bother reading anything other than the claims. Ignore everything else (yes, even the diagrams) unless referenced by the claims.
- Yes, they do try to -- and succeed in -- patenting stuff you can pull out of a textbook. One patent was a near cut-and-paste of some stuff on Kalman filters (that one made me pretty mad).
- Any time a patent lawyer makes a reference to a patent's "teachings", punch them in the nose. These things don't teach anyone anything, that's an impolite fiction for a game that's really all about obfuscation. If there was a patent that described how to nail two boards together, you wouldn't walk away from reading that patent with any useful knowledge.
- The very fact that every company in the US will tell you "Please, for the love of Pete, don't go read patents on your own, without permission" again belies that these things are land-grabs that are never designed to advance the state of the art through teaching.
I am not a lawyer. I do not play one on TV.