(1) The bilateral agreement signed between the foreigner's country and China stipulates that the patent protection shall be granted to the nationals of the other country;
(2) The international treaties concluded between the foreigner's country and China provide patent protection to the nationals of the other country;
(3) Although the foreigner's country and China have not signed bilateral agreements or acceded to international treaties, the other party has stipulated in the patent law or granted patent protection to our nationals in practice according to the principle of reciprocity.