Writing standard of invention patent application

Problem writing of invention patent application: taking air purifier as an example. 1. Write the name of the invention: a XX air purifier. 2. Claim: Write down the technical points you want to protect. 3. Description: Briefly describe the technical background and defects of the existing air purifier, and then write your own technical points and the benefits of improvement (creativity, practicality and novelty). 3. Drawings: Attach picture 3 according to your own point of view.