Does the invention patent need to pay an annual fee in the actual trial stage?

There is no need to pay an annual fee for an invention patent in the actual trial stage, and the patentee starts to pay the annual fee from the year when the patent right is granted. Legal basis: Article 43 of the Patent Law of People's Republic of China (PRC) stipulates that the patentee shall pay the annual fee from the year when the patent right is granted. Article 44 In any of the following circumstances, the patent right shall be terminated before the expiration of the time limit: (1) Failing to pay the annual fee as required; (2) The patentee waives his patent right in writing. Where the patent right is terminated before the expiration of the time limit, it shall be registered and announced by the patent administration department of the State Council.