What information should be collected before patent trading?

1 & gt； Make sure that the patent you buy is valid, usually an authorized invention; 2> Whether there are similar patents, it is best to look at the review report 3 >; Other transaction history of this patent, 4 >; Whether it is necessary to purchase its related patents at the same time, 5 >; Pay attention to the country where the patent is sold, and whether the patent has the same family. 6> It will be clearer through professional agents.