very basic knowledge:
I. patent law = territorial principle.
Of course there is a Chinese PTO and you can get a Chinese patent there. US patents have no value in the rest of the world unless you apply for the same patent worldwide.
II. US patents <> patents for Americans
Us patents = patents for the US market.
Chinese inventors may get US patents.
Once the US imports Chinese goods US patents apply.
IV. Patents are bad for a free market as Hayek told us.
V. You cannot use them as a non-tarific trade barrier.