What is the entry into force of European patents?

After receiving the notice of European patent authorization, the applicant must decide to choose the effective country from the list of countries designated by the European patent organization, and complete the effective procedure within 3 months after the announcement of the authorization. According to the regulations of each effective country, some need to translate all the contents of the patent into the official language of that country and submit it to the effective country; Some only need to translate the patent claims into the official language of the country and submit them to the effective country; Some do not need to submit any translation documents, only need to submit a valid request. If the applicant fails to complete the entry-into-force procedures in a certain country within the time limit, the patent right in that country will be lost.