Invention has long been regarded as a mental activity that can only originate in human beings. However, with the booming of artificial intelligence (AI) technology in recent years, AI has been endowed with the ability to simulate human mental activities and perform innovative tasks by itself. So far, it is reported that AI technology is capable of conducting scientific experiments, developing technical crafts and completing industrial designs. In the near future, AI is even expected to have the capability to discover natural principles and create fundamental knowledge. Against this background, demands have risen for the protection of AI innovation. In particular, the question being asked is can those inventions solely made by AI "inventors" be protected through filing a patent application and be granted, just like those made by human beings?