There are two kinds of patents:
1. Licensed patents
The applicant cannot become the buyer, and the patentee becomes the buyer. The transfer time is about two weeks.
2. Purchase a written undeclared patent.
The inventor and patentee can be buyers when applying for the patent, and the specific time is the same as the authorization time of the three patent applications.
Besides, what if I buy a patent? If it is divided, it is now required that both the inventor and the patentee must be themselves. Here is a reminder.