What are the classifications of patent fields?

The patent system aims to protect technology from infringement of exclusive rights, and any subject other than the obligee can only obtain the right to use the patent through the authorization of the patentee. With the continuous improvement of the legal system, the use of patents presents a diversified trend, and patents are invalid, revoked and expired. Patent applications are divided into three categories, namely, invention patents, utility model patents and design patents, but what are the fields involved in patents? A product, a method or a new technical scheme put forward in the field involved in the patent for improvement of a product or method may apply for a patent for invention; You can apply for a patent for utility model for a new technical scheme that is suitable for practical use according to the shape, structure or combination of products; A new design that is aesthetically pleasing and suitable for industrial application is made according to the shape, pattern or combination of them, and the combination of color and shape and pattern, and can apply for a patent for design. The technical field of patent belongs to as long as it conforms to the patent law. Article 25 of the Patent Law shall not grant a patent right to the following items: (1) scientific discovery; (2) rules and methods of intellectual activities; (3) Methods of diagnosis and treatment of diseases; (4) Species of animals and plants; (5) substances obtained by nuclear transformation; (six) the design of the pattern, color or the combination of the two. The production method of the products listed in Item (4) of the preceding paragraph may be granted a patent right in accordance with the provisions of this Law. International patent IPC divides all technical patent fields into departments, categories, middle categories, large groups and groups, and each group can be subdivided. IPC*** has more than 64,000 entries, and the symbol of each entry consists of letters and numbers, indicating all levels of classification in this classification table.