Amazon America, how to judge which goods can be sold without infringement?
1, which can be found on USPTO: American patent.
Log in to USPTO and click the quick link on the right. After clicking, there will be a quick link of patents and trademarks, and then select patft, which is authorized.
2, Google Maps search identification
3. Use product keywords for Google patent search query.
I hope the above answers can give you some help ~