The time for active modification of the invention is 3 months from the date when the applicant for a patent for invention requests substantive examination and receives the notice that China National Intellectual Property Administration has entered the substantive examination stage.
In addition, the modification is not arbitrary and needs to be within the scope of the original application documents. In other words, you can't add new technologies, improvements, etc. It must be modified in the corresponding position of the original application document.
In addition, after receiving the audit opinion, it can be modified according to the audit opinion.
In addition, if you want to modify the technology itself, you can apply for a new patent within 12 months from the previous patent application date.