The self-service platform for trademark registration inquiry refers to a platform that provides online inquiry for trademark registration information. The following are some common self-service platforms for trademark registration inquiries:

1. National Trademark Registration Office: Each country has its own specialized trademark registration agency, and they usually provide online trademark registration inquiry services. For example, the China National Intellectual Property Administration (CNIPA) provides an online trademark query system, and you can visit their official website to query trademark registration information in China.

2. International trademark query platform: The International Trademark Registration Authority (WIPO) also provides an online trademark query platform called the "International Trademark Query Database" (GlobalBrandDatabase). You can access this platform on WIPO's official website to check trademark registration information from various countries.

3. Trademark database: In addition to the official trademark registration agency, there are also some third-party trademark databases that also provide query functions for trademark registration information. Some of these databases include Trademarkia, TMview, and the USPTO’s trademark database, among others. You can search and query trademark registration information on these platforms.

Please note that the specific self-service platform for trademark registration inquiries may vary by country and region. It is recommended that you visit the corresponding official website or third-party trademark database to query according to the country or region where the trademark you are concerned about is registered.

I hope the above information is helpful to you. If you have additional questions, please feel free to ask.

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