How long is the patent valid? Is it necessary to renew it when it expires?

1. First of all, it is clear that China has relevant patent protection laws and regulations, and the invention patent right is protected by law within the effective time. According to the national patent law of People's Republic of China (PRC), the legal validity period of an invention patent is 20 years. The legal validity period of utility model patent and design patent is 10 year. The above legal validity period is calculated from the date of application.

2. Secondly, patent payment is clearly stipulated in the law, and patents need to be paid every day. The patent right that fails to pay the annual fee according to the regulations will be terminated before the expiration of the time limit.

The last point is that the patent cannot be renewed after it expires. The patent has no legal protection and the patent expires.

To sum up: patents are generally valid for 20 years and need to be paid every year. After expiration, it cannot be renewed.