yes. The patent type can be converted from invention to utility model at any time before the patent application is granted/rejected. The converted patent application has the same filing date as the original application, and can only be converted once, and a conversion fee is required.
20 years
no
The novelty grace period is 6 months before the filing date/priority date.
The novelty grace period is 6 months before the filing date/priority date.
no
yes
The novelty grace period is 12 months before the filing date/priority date.
1-2 years
The initial protection period is 5 years, the renewal period is once every 5 years, and the maximum protection period can reach 15 years.
no