1 There are several methods of patent licensing: general license, exclusive license, and exclusive license. The fees required for these three licensing methods are different, and the rights you get are also different.
2 Generally, patent license royalties are paid in installments, one-time payment or commission based on the profits after the patent is implemented. This requires specific negotiation between you and the patentee.
3 Patent licensing fees vary greatly and cannot be found by the National Patent Office. This fee is determined by the patentee based on the actual situation, and is also determined by evaluation companies.