Even if it works, a patent is to defend your exploitation of the product on that market. If company A defends against company B patent claims, and continue to p

Even if it works, a patent is to defend your exploitation of the product on that market. If company A defends against company B patent claims, and continue to produce the drug, what prevents company B, C, D and E from going to other tribes, moving their disputed-but-dismissed-case patents there, and start producing the drug too? At this point, shouldn't we just ignore patents?