How to verify patent transactions

First of all, if you know the patent number, you can search the announcement of the patent corresponding to this number on the website of the Intellectual Property Office, with the original applicant on it. Then you can check the legal status of this patent on the website of the Intellectual Property Office, such as expiration, invalidity, change, etc. Finally, you can go to the Intellectual Property Office, submit it to 20 yuan, and ask for a patent certificate register of the patent, which records the current real legal status of the patent, such as the obligee after the transfer. The legal basis is the Patent Law of People's Republic of China (PRC).