Once upon a time, they did serve a purpose for people such as Edison who got ripped off right and left, or so I'm told. These days, it's more about putting money in lawyers' pockets because that alleged "protection" technically isn't free: you have to pay someone to defend it. That's why the little guy still goes under. Not to mention his patent might overlap with someone else's just enough for them to try to sue him for stepping over his bounds, supposing he tries making an "improvement". Patents and copyrights are nothing more than a legal minefield. There's nothing intellectually aiding about them, at least not in this era.