In addition, it is best to reserve three months from the change to the issuance of unauthorized patents. It takes 7 to 20 working days to change the patent, and it takes 1 to 2 months to pay for the certificate. If you apply for a patent from scratch, it will take two years for invention and seven months to one year for practical use. If priority is given to inspection, the time can be shortened. Therefore, if you plan to evaluate the professional title, you'd better find a good patent in advance.