1. First of all, each patent number corresponds to a unique patent. Just like the ID card corresponds to each person.
2. As long as you know the patent number, you can check the patent in the State Intellectual Property Office. The most authoritative one is definitely the State Intellectual Property Office. It contains the details of the patent, including the applicant, patentee, full text of the patent, legal status of the patent, etc.
3. Other free websites can also be found, such as Baiteng.com and soopat.
4. If you want to check a foreign language, it is recommended that you go to the European Patent Office or the US Trademark Office to check.