How to treat the legal status of foreign patents

The legal status of U.S. patents needs to be inquired on the website of the U.S. Patent and Trademark Office (http://www.uspto.gov/). The general steps are as follows: through the website of the US Patent and Trademark Office, enter the public query database (public pair) or directly through the website: http://portal.uspto.gov/pair/PublicPair2. Enter the verification code for verification; 3. Enter the patent number for inquiry; 4. Get the basic information of the inquired patent: you can see the status of the inquired patent here. You can also query the patent examination process information through the Image File Wrapper tab and the patent cost information through the Expense tab.