There is only one patent in the material subject, which schools can I go to for my doctorate?

Tongji University. Patent literally refers to exclusive rights and interests. The word "patent" comes from Latin Litteraepatentes. There is only one patent in the material subject that you can go to Tongji University to study for a PhD, that is, an open letter or a public document. It is a certificate used by medieval monarchs to issue certain privileges, and later refers to the exclusive right certificate signed by the British king himself.