Self-taught invention patents can't reach Grade 4. Obtaining the invention patent certificate in the self-taught examination can be used as an item that can be passed in advance before the thesis (or graduation thesis) is defended, but it cannot replace Band 4, because they belong to different types of examination items. When obtaining an undergraduate degree, in addition to compulsory courses, you need to obtain relevant credits as required. According to the regulations, CET-4 is one of the credits that college graduates must have, and it cannot be replaced by the certificate of invention patent recognition. An invention patent is an invention that creatively solves technical problems and can be implemented.