The invention patent review and appraisal date means the date when the patent office makes a review and appraisal of the patent after the patent application has been reviewed. After submitting a patent application, the patent applicant needs to pay the patent application fee in accordance with regulations and wait for the patent office's review and appraisal. During the patent review process, the Patent Office will conduct a series of procedures such as review, retrieval, comparison, and evaluation of the patent application, and finally review and appraise the patent to determine whether the patent complies with the provisions of patent laws and regulations, and whether it is novel and creative. and practicality. The review and appraisal date is the time node for the patent office to review the patent application, and is also an important reference for patent applicants to know the progress of the patent application. If the patent application is approved and granted, the evaluation date will become the effective date of the patent right.