The law pays attention to case analysis, and the description in your question is not comprehensive. 30 categories are dessert bread, and 35 categories are marketing and advertising. 40 categories are food processing services, mainly depending on the other party's business performance to determine whether it is infringing. In this year's trademark judgment, most store signs are defined as 35 kinds of promotional activities aimed at others. Joining a chain store is only a commercial act and can't be regarded as infringement.