Legal basis: Article 21 of the Provisions of the Supreme People's Court on the Applicable Law in the Trial of Patent Dispute Cases is difficult to determine the loss of the obligee or the benefit of the infringer. If there is a reference to the patent license fee, the people's court may reasonably determine the amount of compensation according to the type of the patent right, the nature and circumstances of the infringement, the nature, scope and time of the patent license, and refer to the multiple of the patent license fee. If there is no reference to the patent license fee or the patent license fee is obviously unreasonable, the people's court may determine the amount of compensation according to the type of patent right, the nature and circumstances of the infringement and other factors, in accordance with the provisions of the second paragraph of Article 65 of the Patent Law.