The notice period of preliminary examination is 3 months. The announcement of preliminary examination of a trademark means that the application for trademark registration is approved if it meets the relevant provisions of the Trademark Law after examination. And make an announcement in the trademark announcement. If no objection is raised within three months from the date of the announcement of preliminary examination, the trademark shall be registered and a registration announcement shall be issued at the same time. If no objection is raised within three months or the objection is ruled invalid, the trademark will take effect and a registration certificate will be issued.