Why is the invention patent certification much slower than appearance and utility model?

Compared with utility model and design, the application for a patent for invention has an additional substantive examination procedure, and the duration of substantive examination is uncertain, generally 6- 18 months, so the overall certification is slower than that of appearance and utility model.

In addition, the technical fields of invention patents are wider, and the review cycle of different technical fields is also quite different. The huge application in some technical fields will also lead to slow processing progress; In addition, the quality of patent literature writing will also affect the speed of issuing certificates. The more irregular the writing, the more time it takes to revise one or more times during the examination.

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