I want to buy a patent.

You can go to the national patent technology exhibition and trading center or the local patent technology exhibition and trading center (as long as it is listed). How to do it depends on the degree of market demand and the degree of resistance to imitation. If there is no demand for a patent in the market, it can't be converted into a best-selling commodity and is easy to be imitated, then don't buy it. Buying is equal to buying for nothing! ! If the situation is the opposite, it is a good patent and rich. If the price is reasonable, take it!