Legal analysis: the principle of patent application is also a basic principle in patent application, and its meaning can be understood in two ways. The narrow principle of patent application means that the content of a patent application can only contain one invention, and more than two inventions cannot be filed as one application. The broad principle of patent application not only includes the above meanings, but also includes that the same invention can only be granted one patent right, and the same invention cannot have two or more patents at the same time.
Legal basis: Article 31 of the Patent Law of People's Republic of China (PRC). An application for a patent for invention or utility model shall be limited to one invention or utility model patent. Two or more invention patents or utility model patents belonging to a general inventive concept may be filed as one application. An application for a patent for a design shall be limited to a design used by a product. Two or more designs of products sold or used in the same category in sets may be filed as one application.