Once the patent right is transferred, the transferee becomes the patentee and the transferor is no longer the patentee. Therefore, the right to re-transfer the patent belongs to the transferee. Unless the transfer contract clearly stipulates that the patent rights cannot be transferred again, the transferee can re-transfer the patent rights. If the patent right belongs to two persons, one of them can enjoy the share of the transferred patent right. Article 340 of the Contract Law of the People's Republic of China and the State of the People's Republic of China: The technological achievements of cooperative development belong to the inventions and creations completed through cooperative development. Unless otherwise agreed by the parties, the right to apply for a patent belongs to the parties to the cooperative development. . If one party transfers its exclusive right to apply for a patent, the other parties shall have the priority to receive the transfer under the same conditions. If one party to a joint development declares to give up its exclusive right to apply for a patent, the other party may apply alone or the other parties may apply jointly. If the applicant obtains a patent right, the party that gives up the right to apply for the patent can exploit the patent free of charge. If one party to the cooperative development does not agree to apply for a patent, the other party or other parties may not apply for a patent.