What are the legal provisions of invalid patent protection?

1. Article 38 of the Patent Law of People's Republic of China (PRC) stipulates: "In the case of patent invalidation as stipulated in Article 37, China National Intellectual Property Administration shall make an award in accordance with the provisions of this Law, and the original patent right shall be terminated after the award takes effect."

2. Article 66 of the Detailed Rules for the Implementation of Patents in People's Republic of China (PRC) stipulates: "After the expiration of the patent right for inventions and utility models, the patentee or obligee may apply for invalidation of the patent."

3. Article 68 of the Detailed Rules for the Implementation of Patents in People's Republic of China (PRC) stipulates: "The patentee or obligee may file an application for invalidation of a patent in China National Intellectual Property Administration, and the obligee who files the application shall provide proof of his rights."