A U.S. patent application can request non-disclosure, but the following conditions must be met:
The U.S. patent must not have a prior application in a country that implements the 18-month disclosure system;
After requesting non-disclosure, the U.S. patent cannot be applied to countries that implement the 18-month disclosure system.
Therefore, if the U.S. patent has been previously filed in other countries, the U.S. patent cannot request non-disclosure; if the U.S. patent is applied for in other countries only after the application is not disclosed, then The USPTO must be notified 45 days from the filing date of the invention patent application in other countries. If not notified within 45 days, the US patent application will be invalidated after 45 days.