In Article 42 of the Patent Law, the term of the invention patent right is 20 years, and the term of the utility model patent right and the design patent right is 10 years, both of which are counted from the date of filing.
Article 1 1. Except under the circumstances stipulated in Articles 28 and 42 of the Patent Law, the date of filing mentioned in the Patent Law, where there is priority, means the priority date.
2、ABC
First, exhaustion (parallel import), no infringement.
B, for the purpose of scientific research, no infringement.
C, Paula exception, no infringement.
D. Party A's priority date is earlier than Party B's necessary preparation time, which does not conform to the principle of preemption. B infringement.