Amortization, intangible assets are amortized evenly in stages within the expected service life from the month of acquisition and included in profit and loss.

Different provisions have been made on the amortization methods of intangible assets with different properties:

First, the amortization amount of intangible assets with limited service life should be amortized systematically and reasonably within the service life.

Second, intangible assets with uncertain service life should not be amortized.

An enterprise shall review the service life of intangible assets with uncertain service life in each accounting period. If there is evidence that the service life of intangible assets is limited, its service life shall be estimated and handled in accordance with the provisions of these Standards.

Intangible assets with valid term stipulated by law shall include:

(1) patent right. The legal validity period of the invention patent right is 15 years; The legal validity period of the patent right for utility model and design is 5 years, counting from the date of application, and the patentee may apply for an extension of 3 years before the expiration.

(2) trademark rights. The legal validity period of a registered trademark is 10 year.