National invention patents can be bought. The patentee needs to sign a written patent transfer contract with the transferee, stating the basic information of the transferor and the transferee, the transfer period, the transfer fee and the payment method, and then go to the patent office for corresponding registration.
Legal objectivity:
Article 12 of the Patent Law of People's Republic of China (PRC) Any unit or individual who exploits another person's patent shall conclude an exploitation license contract with the patentee and pay the patentee the royalties. The licensee has no right to allow any unit or individual other than those stipulated in the contract to exploit the patent. Article 13 of the Patent Law of People's Republic of China (PRC) After the publication of an application for a patent for invention, the applicant may require the entity or individual who exploits the invention to pay an appropriate fee. Article 14 of the Patent Law of People's Republic of China (PRC), if the invention patent of a state-owned enterprise or institution is of great significance to national interests or public interests, the relevant competent department of the State Council and the people's governments of provinces, autonomous regions and municipalities directly under the Central Government may, with the approval of the State Council, decide to popularize and apply it within the approved scope, allowing designated units to implement it, and the implementing units shall pay royalties to the patentee in accordance with state regulations.