Invention refers to a new technical scheme proposed for a product, method or its improvement.
Utility model refers to a new practical technical scheme for the shape, structure or combination of products.
Appearance design refers to a new design with aesthetic feeling and suitable for industrial application based on the shape, pattern or combination of products and the combination of colors, shapes and patterns.
Invention, utility model and design are three different types of patents. The process of application and review, the object of protection and the time limit are not exactly the same.