Does the patent licensor have to be the patentee?

Usually, the licensor of patent exploitation must be all patentees (applicants). Except for the following two cases:

(1) Licensor has previously signed a patent exploitation license contract with the patentee (patent applicant), which indicates that the patentee grants the licensee the right to exploit the patent.

(2) The applicant for a patent or the patentee has licensed others to exploit the patent by ordinary license in accordance with Article 15 of the Patent Law.