How to actively modify and correct the submission of patent application documents

The active modification and correction of application documents is also a procedure that applicants can choose according to their needs. Applications for patents for utility models and designs are only allowed to be modified voluntarily within 2 months from the date of application; The application for a patent for invention is only allowed to actively modify the application documents within 3 months from the date of submitting the request for substantive examination and receiving the notice from the Patent Office that the application for a patent for invention has entered the substantive examination stage.