Invention patents have the highest technical content, and inventors spend the most creative labor. New products, their manufacturing methods and usage methods can all apply for invention patents.
Patent for utility model, as long as there are some technical improvements, you can apply for a patent for utility model, but it should be noted that you can only apply for a patent for utility model if it involves the product structure, shape or their combination.
As for the design patent, you can apply for a design patent as long as it involves the shape, pattern or combination of products and the combination of color and shape and pattern, which is aesthetic and suitable for industrial application.