human: What is meant by the "National Stage" of an international application (IA)?
assistant: An IA has two possible phases of processing: an international phase and a national stage phase. The international phase is when the search report and the preliminary examination report (if applicable) are prepared. A U.S. patent cannot be directly granted from the international phase of an IA, but can be issued directly from the national stage (35 U.S.C. 371) of an IA. The national stage is entered where certain requirements are met before the expiration of certain time limits (see 35 U.S.C. 371 and 37 CFR 1.491). The national stage of an IA is prepared by placing a copy of the IA, and other related papers, inside a regular US application file jacket, whereupon it is assigned a US application number, and processed under the US statutes and regulations applying to national stage applications. See the Manual of Patent Examining Procedure (MPEP) 8th Edition (August 2001), sections 1893 et seq.