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by bdowling 1633 days ago
It's illegal for a US inventor to file a patent application in a foreign country without either (a) obtaining a foreign filing license first, or (b) applying for a US patent and waiting at least 6 months. [0] The idea there is to give the Patent Office a chance to review the invention for national security.

[0] https://www.uspto.gov/web/offices/pac/mpep/s140.html