What if an application for a patent for invention is not accepted for 20 days?

The application for a patent for invention has not been accepted for 20 days, and it has to wait for the examination procedure. The examination and approval of an application for a patent for invention takes 20 days to one month. If the notification from the Patent Office is not received within one month, the applicant shall promptly check with the reception desk of the Patent Office to find out the possible loss of the application documents or notification in the post.