According to the provisions of the Patent Law of the People's Republic of China, a patent application for an invention or a utility model can only be filed for one invention or utility model. However, two or more inventions or two or more utility models that belong to one general inventive concept can also be filed as one patent application. A patent application that can be filed as one application satisfies two or more inventions or two or more utility models that belong to a general inventive concept. The conditions for filing as one patent application are: the two or more inventions or utility models must belong to A general inventive concept should be technically interrelated and contain one or more identical or corresponding specific technical features, where the specific technical features refer to each invention or utility model as a whole, and have contributions to the existing technology. Technical characteristics of the contribution. The "Patent Law of the People's Republic of China" also stipulates that a design patent application should be limited to one design used in one product, but the design is used for Two or more designs of products of the same category that are sold or used in sets can be filed as one patent application. The conditions for filing two or more designs as one patent application are that the designs are used for products of the same category and are sold or used in sets. This means that each product has the same design concept and is customarily sold and used at the same time. When applying, the serial number of each design should be marked before the view name of each product using the design.