In Japan, it is necessary for the patent owner to prove that the infringed suspect infringes the patent.
That is one reason why the patent owner can not win in court.
Therefore, in 2018, a system will be introduced in which a neutral technical expert appointed by the court can conduct a survey (such as investigation into factories etc.) against the infringed suspect.
When this system is introduced, the patent owner may become easy to win in court.