How to write the abstract of patent application specification?

The abstract of the specification shall indicate the summary of the disclosure of the application for a patent for invention or utility model, that is, the name and technical field of the invention or utility model, and clearly reflect the technical problems to be solved, the main points of the technical scheme to solve the problems and the main uses. The abstract of the specification can contain the chemical formula that best explains the invention; For a patent application with drawings, pictures shall also be provided.