·During the patent application process, what is the difference between the examination opinion notice and the supplementary letter issued by the Patent Office?

The examination action notice generally points out that your patent application document may not meet the conditions for granting patent rights such as novelty, inventiveness or practicality, and requires your analysis and response. The correction letter mainly points out the textual and material defects in your patent application document, and you only need to make corrections as required by the examiner.