How to tell which patent it is?

According to the patent number, if the first number after the year is 1 or 8, it is an invention, such as 0100874.3, 2005 10 126732.8, etc.

If the first number after the year is 2, it is a utility model, for example, 0325472 1.0.

If the first number after the year is 3, it is the appearance, such as 2007300574 12.5.