Legal analysis: according to the law, well-known trademarks are not protected by all categories, but only by different levels of cross-category protection, that is, according to the well-known degree of well-known trademarks, they can get different levels of cross-category protection. For example, Haier, because of its high popularity, almost all categories are covered by the industrial and commercial departments in cross-category protection, but some well-known trademarks with low popularity will not be protected in some categories that will not mislead the public. In practice, well-known trademarks recognized by the State Administration for Industry and Commerce have received a lot of cross-class protection. For example, the Trademark Office examines the application for trademark registration, and the industrial and commercial department examines the application for enterprise name, which generally takes care of well-known trademarks. That is to say, if the trademarks applied for registration are well-known trademarks that have been copied, imitated or translated by others and are prepared to apply for registration on different or similar goods, the Trademark Office will generally take the initiative to disapprove the registration of these trademarks, and the local industrial and commercial departments will also take the initiative to disapprove them.

Legal basis: Trademark Law of People's Republic of China (PRC).

Article 13 Trademark holders who are well-known to the relevant public think that their rights have been infringed may request the protection of the well-known trademark in accordance with the provisions of this Law. A trademark applied for registration on the same or similar goods is a well-known trademark copied, imitated or translated by others, which is not registered in China. It is easy to cause confusion, so it is not registered and prohibited to be used. Where a trademark applied for registration on different or dissimilar goods is a well-known trademark registered by others in China, misleading the public and possibly harming the interests of the registrant of the well-known trademark, it shall not be registered and its use shall be prohibited.

Article 14 A well-known trademark shall, at the request of the parties concerned, be recognized as a fact that needs to be recognized in handling trademark cases. The following factors should be considered when identifying a well-known trademark: (1) the awareness of the trademark by the relevant public; (2) the term of use of the trademark; (3) the duration, degree and geographical scope of any publicity work of the trademark; (4) The record that the trademark is protected as a well-known trademark; (5) Other factors that make the trademark famous. In the process of trademark registration examination and investigation by the administrative department for industry and commerce, if the parties claim their rights in accordance with the provisions of Article 13 of this Law, the Trademark Office may, according to the needs of examination and handling of the case, make a determination on the well-known situation of the trademark. In the process of handling trademark disputes, if the parties claim their rights in accordance with the provisions of Article 13 of this Law, the Trademark Review and Adjudication Board may, according to the needs of handling cases, make a determination on the well-known trademark. In the process of trying trademark civil and administrative cases, if the parties claim their rights in accordance with the provisions of Article 13 of this Law, the people's court designated by the Supreme People's Court may, according to the needs of trying the case, determine the well-known trademark. Producers and business operators shall not use the words "well-known trademarks" on commodities, commodity packages or containers, or in advertising, exhibitions and other commercial activities.