General drugs apply for invention patents in China, and the protection period of invention patents in China, the United States and Japan is 20 years.
Therefore, it is almost certain that the patent protection period of drugs in China, the United States and Japan is 20 years.
At the same time, it is necessary to pay annual fees in accordance with relevant regulations, which is true in all countries. Failure to pay the annual fee shall be deemed as automatic waiver of the patent right.
It's just that each country pays patent fees in different ways every year.