Therefore, a patented product will theoretically have more than two patent numbers. However, because more than two inventions or utility models belong to one general inventive concept, they can be filed as one application; An application for a patent for design shall be limited to a design used by a product; Two or more designs of similar products sold or used in complete sets may be filed as one application. In these cases, from the perspective of saving time and cost, a patented product generally has only 1 patent number.