(2) The examination of the application for a patent for utility model takes the form of examination, and the examination of the application for a patent for invention requires substantive examination (patent three-dimensional examination). The examination period of utility model is short, while the examination period of invention is long. After the examination of the utility model, the authorization shall be announced, and the invention shall be disclosed before the announcement.
(3) The protection period of utility model is 10 year, and the protection period of invention is 20 years;
(4) Compared with inventions, the patent stability of utility models is not so stable.