Legal analysis: There are four legal ways to protect well-known trademarks: First, in trademark objection cases, request well-known trademark protection from the Trademark Office of the State Administration for Industry and Commerce. Second, in cases where a trademark is not registered for re-examination and requests for invalidation, the Trademark Review and Adjudication Board of the State Administration for Industry and Commerce is requested to protect well-known trademarks according to law. Third, in the case of complaining about trademark violations, request the protection of well-known trademarks from the administrative department for industry and commerce at or above the city (prefecture) level where the violations occurred. Fourth, in civil litigation cases of trademark infringement, the people's court shall request the protection of well-known trademarks according to law.

Legal basis: Provisions on the Recognition and Protection of Well-known Trademarks promulgated by the State Administration for Industry and Commerce.

Article 5 In trademark management, if a party considers that a trademark used by another person belongs to the circumstances specified in Article 13 of the Trademark Law and requests to protect its well-known trademark, he may submit a written request to the administrative department for industry and commerce at or above the city where the case occurred and submit relevant materials to prove that his trademark is well-known.