Patent evaluation fee is generally charged according to the evaluation value, and the evaluation fee is 10%. Patent evaluation is an act of confirming, evaluating and reporting patent rights according to specific purposes, following fair and legal standards and procedures, and using appropriate methods to provide value scales for asset business. Because it can be authorized without substantive examination, utility model and appearance patents are considered unstable and "gold content" is not high. If you get a positive patent evaluation report issued by the Patent Office, it means that the patent has been authorized by the State Patent Office again, and the stability and gold content of the patent will be further recognized.