Applications for patents for utility models and designs are only allowed to be actively modified 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 China National Intellectual Property Administration Patent Office that the application for a patent for invention has entered the substantive examination stage. If it exceeds the above-mentioned prescribed time limit, the China National Intellectual Property Administration Patent Office will take the initiative to make amendments, and it will be deemed that no amendments have been made.
Generally speaking, the modification of the instruction manual is mainly limited to the non-essential part, and the modification of the essential part of the instruction manual, that is, the purpose, technical scheme, effect and embodiment of the invention, is generally not allowed, and can only be considered under very special circumstances. Modification of design pictures or photos is limited to tracing unclear lines, painting unprotected words, or correcting obvious errors and inconsistencies in the view.