U.S. patents can be queried on the following website.

1. United States Patent and Trademark Office website/5i-2/

China Patent Information Network

Extended information

Applying for a foreign patent Issues that need attention when applying for a foreign patent

1. Whether the invention-creation applied for a foreign patent involves major national interests or needs to be kept confidential. For inventions and creations that do not involve major national interests or do not require confidentiality, you can apply for a patent from a foreign country; conversely, you cannot apply for a patent from a foreign country.

2. Whether the invention can be the subject of protection by the patent law of the country where the application is made, and whether it meets the patentability requirements of that country. Generally speaking, applicants must have a certain understanding of the patent law of the country where they are applying and have a certain degree of confidence that their patent application will be approved before filing a patent application in that country.

3. Whether the invention has market potential in the country where the application is filed, whether there are competitors, and whether it is necessary to obtain exclusive implementation rights. Generally speaking, filing a patent application should be considered only when it is necessary and when benefits are expected to be obtained.