Specifically, patent authorization must be approved by China National Intellectual Property Administration, which conforms to three characteristics, namely novelty, creativity and practicality. If the same technical scheme has been publicly used and sold by others before China National Intellectual Property Administration applied for a patent, then this technical scheme is already that the existing technology does not have novelty, and this technical scheme will not be authorized. But in fact, there are three kinds of patents: invention, utility model and design. Only before the invention is authorized, it needs to be examined in substance by three parties, and it needs to be searched and compared. However, before applying for the authorization of utility model and design, there is no need for retrieval and substantive examination. Many patent applications for utility models and designs that are not novel, creative and practical are authorized after formal examination, but this is not important. You can apply for this patent in China National Intellectual Property Administration before it is put into public use.