Which is valid, the EU patent or the certificate of China National Patent Office?

The EU patent is valid. The grant of European patent is an invention patent with industrial practicability, absolute novelty and creativity, and the validity period of EU patent application is 20 years from the date of filing. The European Patent Office is a patent organization in which most European countries participate. After being granted by the European Patent Office, the German patent can be obtained by directly performing the registration procedures in Germany.