Legal analysis: Joint trademark means that the trademark owner registers several similar trademarks on the same commodity, or several identical or similar trademarks on different commodities in the same category. These mutually similar trademarks are called joint trademarks. Among these trademarks, the main trademark is the first registered or mainly used, and the rest are joint trademarks.

Legal basis: The goods or services specified in Article 39 of the Regulations for the Implementation of the Trademark Law of People's Republic of China (PRC) in the application for international registration of trademarks shall not exceed the scope of the goods or services applied for or registered in China.