If you did it like that, then it would be trivial to take away all Patents. Just create a shell company that infringes, sell the product to another shell company, and then the patent would be gone since the holder company didn't take action. It is almost impossible for a patent holder to know the implementation details of every other company in order to detect infringement. Typically it is patent is granted, someone comes along and infringes, the holder gets notified somehow, and then legal action is taken. There is always going to be a period of time where the holder doesn't know their patent is being infringed. Also, the holder does have the right to take no legal action against an infringement.