I would imagine in most cases you can't invalidate a patent without going to trial. I could be wrong on this. From what I've read, it seems if a patent troll f

I would imagine in most cases you can't invalidate a patent without going to trial. I could be wrong on this. From what I've read, it seems if a patent troll feels they might lose the case they'll drop it. Why risk losing the patent when you can just move on to the next mark?