Is it illegal to collect royalties?

Yes The act of patent exploitation itself is legal; It is illegal for Zhang to collect royalties alone. According to the regulations, if there is an agreement on the exercise of the right to apply for a patent or the patent right, such agreement shall prevail. If there is no agreement, * * * someone can exploit the patent alone or license others to exploit it by ordinary license; Where another person is licensed to exploit the patent, the royalties collected shall be distributed among the owners. In this project, Zhang and Company A have no agreement on the exercise of the patent right, and both parties can implement the patent separately.