The patent retrieval system in China National Intellectual Property Administration, China can retrieve American patents. The system collected patent data from 103 countries, regions and organizations, including China, the United States, Japan, South Korea, Britain, France, Germany, Switzerland, Russia, the European Patent Office and the World Intellectual Property Organization. If you want to search the patent information in the United States, you can query it through the patent retrieval system in China National Intellectual Property Administration, China.