Legal analysis: If both parties to the patent pledge are domestic individuals or units, the parties may go to the Patent Affairs Service Department of the Department of Preliminary Examination and Process Management of China National Intellectual Property Administration Patent Office or to the dispatched office established by the State Patent Office. Where both parties to the patent pledge involve foreigners, foreign enterprises or other foreign organizations (including Hong Kong, Macao and Taiwan), the parties concerned shall go to the service office of the preliminary examination department in the State Council.

Legal basis: Article 444 of the Civil Code of People's Republic of China (PRC) pledges the property rights in intellectual property rights such as the exclusive right to use registered trademarks, patents and copyrights. The pledge is established at the time of pledge registration.

After the pledge of property rights in intellectual property rights, the pledgor may not transfer or license others to use them, unless the pledgor and the pledgee agree through consultation. The pledgor shall pay off the debts in advance to the pledgee or deposit the price for transferring or allowing others to use the pledged intellectual property rights.