Is it an infringement to use a patent with a public legal status to participate in a planning competition?

Yes, because patent rights are generally disclosed within a certain period of time after being certified by the national intellectual property agency to see if it violates the rights of others. If no one reports it within this period, after the period, the state The Intellectual Property Office will issue an intellectual property certificate. In the future, any individual, unit, or economic organization that uses this patent must obtain the consent of the patentee, regardless of whether the patent is public or not. Therefore, use a patent with a public legal status to participate in the program. The competition is an infringement, I hope my answer can be helpful to you!