What does it mean that the substantive examination period of invention patent exceeds three years?

It means that it is under review, and it is possible that the review actually started late (the examiner called), and several notices of review opinions were sent back and forth, or there may be more cases in the responsible department.

1. If it goes well, the examiner didn't find any mistakes and previous similar products and technologies. Then after the substantive examination takes effect, you will definitely be given an "authorization registration notice" within half a year.

2. If there is a problem, the examiner will call you in about half a year; The reply time is 4 months. According to the fastest reply, you can reply the next day. Then the examiner will come back

It will be handled in about 3 or 4 months. If there is no problem, issue authorization registration. If there is a problem, it will continue to send two links and three links. Then the time of authorization is not easy to determine.