The meaning and exception of the principle of oneness in the application for patent for invention

Uniqueness means that an application for a patent for an invention or utility model should be limited to one invention or utility model, and two or more inventions or utility models belonging to a general inventive concept can be filed as one application. That is to say, if an application includes several inventions or utility models, only one general inventive concept among all these inventions or utility models will be allowed. This is a single requirement of patent application. There is a very important saying here-a general inventive concept makes them interrelated. That is to say, several technical features must all contain the same key points, such as: claim 1: filament A. claim 2: bulb made of filament A. claim 3: searchlight is equipped with bulb B made of filament A and rotating device C. These three claims have the same specific technical features, so there is oneness between them.