How to determine the amortization period of patent right

According to the relevant provisions of the Regulations for the Implementation of the Enterprise Income Tax Law of People's Republic of China (PRC), the patent right belongs to intangible assets, and the amortization expenses of intangible assets calculated by the straight-line method are allowed to be deducted. The amortization period of intangible assets shall not be less than 10 year. Intangible assets as an investment or transferee whose service life is stipulated by relevant laws or agreed in the contract may be amortized in installments according to the stipulated or agreed service life.