Legal basis: Article 33 of the Patent Law of People's Republic of China (PRC), an applicant may modify his patent application documents, but the modification of the application documents for patents for inventions and utility models shall not exceed the scope recorded in the original specifications and claims, and the modification of the application documents for patents for designs shall not exceed the scope shown in the original pictures or photographs.
Article 59, paragraph 1 paragraph 13 of the Supreme People's Court's Provisions on the Applicable Law in the Trial of Patent Disputes stipulates that "the scope of protection of the patent right of an invention or utility model shall be subject to the contents of the claim, and the contents of the claim may be explained by the description and drawings", that is, the scope of protection of the patent right shall be subject to the scope determined by all technical features recorded in the claim, including the scope determined by features equivalent to the technical features.