Whether the manufacturer can be sued for trademark infringement depends on whether the merchant knows about the fraudulent use of another person's registered trademark and whether it belongs to processing on behalf of others. The situation is different, and whether the manufacturer can be sued as a defendant is different. Under normal circumstances, you can entrust a lawyer to investigate the manufacturer's knowledge and sue after obtaining favorable evidence.

Legal objectivity:

trademark act

Article 47

A registered trademark that has been declared invalid in accordance with the provisions of Articles 44 and 45 of this Law shall be announced by the Trademark Office, and the exclusive right to use the registered trademark shall be regarded as nonexistent from the beginning. The decision or ruling declaring a registered trademark invalid has no retrospective effect on the judgment or ruling of trademark infringement cases made and executed by the people's court before the invalidation, the conciliation statement, the decision on handling trademark infringement cases made and executed by the administrative department for industry and commerce, and the executed trademark transfer or use license contract. However, if losses are caused to others due to the malice of the trademark registrant, compensation shall be made. If the trademark infringement compensation, trademark transfer fee and trademark use fee are not returned in accordance with the provisions of the preceding paragraph, which obviously violates the principle of fairness, they shall be returned in whole or in part.