Thank you very much for your mail.If the contents of this product are produced by your company, it seems to infringe the attached USA patent.In addition, it seems that you also infringe our raw material patent in the US.If there is a possibility of exporting any products outside your contract area, we think that you have made a prior offer until now.Did your further research determine that this product was delivered by you and sold by Yenping in the United States?That is likely to be a big problem.