Secondly, from the perspective of patent application review, the application for a patent for invention needs to undergo substantive review, that is, patentability review, which is more stringent, while the application for a patent for utility model is only a formal review, and does not involve patentability review. Therefore, it is necessary to distinguish clearly when making patent transfer.
Finally, from the point of view of the stability of patent right, the invention is subject to substantive examination, so once the patent right is obtained, its right is relatively stable and not easy to be declared invalid, while the utility model is not subject to substantive examination, even if it is patented, its right is very unstable and easy to be declared invalid.
Of course, in addition to the above three points, the protection period of utility model patent application and invention patent application is also different. The protection period of the invention is 20 years, and that of the utility model is 10 year. The above is the most obvious difference between utility model patent and invention patent.
In terms of application time, it takes 2-3 years for invention patents, and only 6 months for utility model authorization!
I hope I can help you ~