There are three kinds of patents that can be applied for in China, namely invention patents, utility model patents and design patents. Among them, the invention patent has the highest gold content, and it is of course the most difficult to apply. It needs to pass the substantive examination before authorization, and the application cycle takes about 2-3 years. Therefore, when we are not sure about technology in the research of invention patents, we can focus on utility model patents or design patents. Comparatively speaking, utility model patents are more popular.