What does the utility model patent mean by 4 stars?

The star rating of the utility model patent is 4, 1 is the worst, and 5 is the best. The utility model patent is one of the three types of patents, and the utility model refers to a new practical technical scheme for the shape, structure or combination of products. The patent law requires lower creativity and technical level of utility model than invention patent, but it has great practical value. In this sense, utility models are sometimes called small inventions or small patents.