1. Invention refers to a new technical scheme for a product, method or its improvement, which mainly embodies novelty, creativity and practicality. Patent inventions are divided into product inventions (such as machines, instruments and equipment, appliances) and method inventions (manufacturing methods).
2. Utility model refers to a new practical technical scheme for the shape, structure or combination of products. The utility model patent can be granted without substantive examination, with relatively simple procedure and relatively low cost. Therefore, small inventions about tangible products such as daily necessities, machinery and electrical appliances are more suitable for applying for utility model patents.
3. 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 color and shape and pattern. The object of design patent protection is the decorative or artistic design of products, which can be graphic design or three-dimensional modeling, and more commonly, the combination of the two. The main condition for granting a design patent is novelty.
I hope I can help you!