Is it necessary to pay the substantive examination fee before the invention patent is published? How soon will the notice of preliminary compliance be published?

There is no need to pay the substantive examination fee before the publication of the invention patent, and it will be paid when the actual examination request is submitted. The time limit is within three years from the date of application (priority date).

The invention patent will be published 18 months after the application date (priority date), and the applicant has no request or statement.

Of course, you can also apply for an advance announcement, and the applicant needs to make a written statement without any conditions.