What are the problems of patent pledge financing at present?

Patent pledge financing is very difficult in practice. First of all, it is difficult to evaluate the value of patent rights, most of which are carried out by using the evaluation method of tangible assets, and the evaluation results are difficult to be recognized by financial institutions; On the other hand, at present, China's trading platform is not perfect, trading laws and regulations are not perfect, patent trading and pledge are difficult to realize, and financial institutions can't handle it, which affects the interests of financial institutions.