How do foreigners who have no habitual residence in China apply for patents?

Article 18 of the Patent Law of People's Republic of China (PRC) stipulates that if a foreigner, foreign enterprise or other foreign organization that has no habitual residence or business office in China applies for a patent in China, it shall be handled in accordance with the agreement signed between his country and China or the international treaty to which * * * is a party, or in accordance with the principle of reciprocity. Article 19 of the Patent Law stipulates that foreigners, foreign enterprises or other foreign organizations that have no habitual residence or business office in China shall entrust a patent agency designated by the patent administration department of the State Council to apply for a patent and handle other patent affairs in China.