How to download patents for free on the patent network?

the principle of the patent system is: exchange publicity for protection, that is to say, all patents (except confidential applications and national defense patents involving national defense and national security) can be publicly obtained, which is also the general rule of the patent system all over the world.

specifically, in China, you can log on to China National Intellectual Property Administration's website to download patents: www.sipo.gov.cn, click "Patent Search and Query Item" under the column of "Services", click "Patent Search and Analysis" after entering, and then click "Patent Search" to search for patents in various ways, such as searching by inventor, patentee, invention name, etc., and you can click "View file details" for the searched patents.