Article 23 Any dependent claim of an invention or utility model shall contain a reference portion and a characterizing portion, and be presented in the following manner:

(l) a reference portion: indicating the serial number(s) of the claim(s) referred to, and the title of the subject matter;

(2) a characterizing portion: stating the additional technical features of the invention or utility model.

Any dependent claim shall only refer to the preceding claim or claims. Any multiple dependent claims, which refer to two or more claims, shall refer to the preceding one in the alternative only, and shall not serve as a basis for any other multiple dependent claims.

Article 24 The abstract shall consist of a summary of the disclosure as contained in the application for patent for invention or utility model. The summary shall indicate the title of the invention or utility model, and the technical field to which the invention or utility model pertains, and shall be drafted in a way which allows the clear understanding of the technical problem, the gist of the technical solution of that problem, and the principal use or uses of the invention or utility model.

The abstract may contain the chemical formula which best characterizes the invention. In an application for a patent which contains drawings, the applicant shall provide a figure which best characterizes the technical features of the invention or utility model. The scale and the distinctness of the figure shall be as such that a reproduction with a linear reduction in size to 4cm x 6cm would still enable all details to be clearly distinguished. The whole text of the abstract shall contain not more than 300 words. There shall be no commercial advertising in the abstract.

Article 25 Where an invention for which a patent is applied concerns a new biological material which is not available to the public and which cannot be described in the application in such a manner as to enable the invention to be carried out by a person skilled in the art, the applicant shall, in addition to the other requirements provided for in the Patent Law and these Rules, go through the following formalities:

(1) depositing a sample of the biological material with a depositary institution designated by the patent administration department under the State Council before, or at the latest, on the date of filing (or the priority date where priority is claimed), and submit at the time of filing or at the latest, within four months from the filing date, a receipt of deposit and the viability proof from the depository institution; where they are not submitted within the specified time limit, the sample of the biological material shall be deemed not to have been deposited;

(2) giving in the application document relevant information on the characteristics of the biological material;

(3) indicating, where the application relates to the deposit of the biological material, in the request and the description the scientific name (with its Latin name) and the name and address of the depositary institution, the date on which the sample of the biological material was deposited and the accession number of the deposit; where, at the time of filing, they are not indicated, they shall be supplied within four months from the date of filing; where after the expiration of the time limit they are not supplied, the sample of the biological material shall be deemed not to have been deposited.

Article 26 Where the applicant for a patent for invention has deposited a sample of the biological material in accordance with the provisions of Article 25 of these Rules, and after the application for patent for invention is published, any entity or individual that intends to make use of the biological material, to which the application relates, for the purpose of experiment shall make a request to the patent administration department under the State Council, containing the following items:

(1) the name or title and address of the claimant;

(2) an undertaking not to make the biological material available to any other person;

(3) an undertaking to use the biological material for experimental purpose only before the grant of the patent right.