You can check it yourself: 1. The archives of the Trademark Office is responsible for trademark inquiry. Second, the public security, courts, procuratorates, national security, discipline inspection and supervision, audit institutions and other departments to inquire about trademark files, the inquiry personnel shall show their valid certificates and submit relevant official letters. 3. If a law firm or trademark agency is entrusted by a party to inquire about the files of the party's own trademarks, the inquirer shall show his valid certificate, and submit the power of attorney of the party, the valid identity certificate of the party and the letter of introduction from the law firm or trademark agency. 4. When a law firm or trademark agency acts as an agent in litigation activities, it may inquire about the files of the trademarks involved, and the inquirers shall show their valid certificates, and submit the relevant certificates of the court, the power of attorney of the parties and the letter of introduction from the law firm or trademark agency. 5. Where a trademark registrant inquires about its trademark file, the inquirer shall produce a valid certificate. If the registrant is a company, a letter of introduction from the company and a copy of the business license stamped with the official seal shall be submitted. Six, law firms or trademark agencies and trademark registrants need to obtain trademark files for document identification, in addition to the above procedures, the appraiser should also submit the introduction of the appraisal agency.