Federal regulations require that an awardee file patent applications in additional countries or international patent offices within either ten months of the filing date of a corresponding regular U.S. patent application or six months from the date permission is granted by the Commissioner of Patents and Trademarks to file foreign patent applications in situations in which such filing has been prohibited by a Secrecy Order. The following sections of 37 CFR 401 explain this requirement:
37 CFR 401.2 - Definitions 37 CFR 401.14 - Standard Patent Rights Clauses "Invention Disclosure"
Law - Other Patent Applications Filing Date