What are the ways to inquire about patent categories? How to make an inquiry?

What are the ways to inquire about patent categories? How to make an inquiry? First of all, patents in China can be roughly divided into three types: invention, utility model and design. Among them, the patent number is replaced by the corresponding patent number; Through the corresponding classification, we can distinguish the categories of patents, mainly according to the types and fields of patents. So how do you query the patent category? Classification can be queried through international classification, and there is also a method of drawing lessons from international classification in China, which is called ipc classification. What are the ways to inquire about patent categories? The international patent classification has been widely used in the classification and retrieval of patent documents all over the world. It is revised every five years, and the third or fourth edition is commonly used, represented by IntCl~3 or IntCl~4. International patent classification is very useful and we should fully understand it. First, it is used to classify patent documents. For example, when applying for a patent, relevant patent application documents must be submitted to the Patent Office, and the patent descriptions in these documents must be classified according to a unified classification. Only in this way can it be convenient to inquire when needed. If there are: Part A-Necessary for human life (agriculture, light industry and medicine), Part B-Operation and transportation, Part C-Chemistry and metallurgy, Part D-Textile and papermaking, Part E-Fixed buildings (architecture and mining), Part F-Mechanical engineering, Part H-Physics-Electrical patent application, there are many ways to search adc.png patents: International Patent Classification (IPC) and European patent classification number. The common patent category query is IPC；; On the website of the European Patent Office, either IPC or ECLA；; Can be used; However, CCL can only be used on the website of the United States Patent and Trademark Office. Japan' s fi/f-$ TERM is rather complicated, so we generally don' t use it.