no
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.
no
1-2 years
5-6 years
The novelty grace period is 6 months before the filing date/priority date.
7 years
20 years
no
no
no