There are two types of patent applications which can be filed regarding geography, these include country specific or national applications and international applications. National applications for the U.S. are filed with the USPTO under 35 U.S.C. § 111. The rules for national applications varies based on what country the application is filed in. The other type of application is an international application which is filed under the patent cooperation treaty (PCT). The international applications select a country to which the application will be progressed to at the national stage. When the international application enters the national stage it is considered a national application. The filing date of these applications for the U.S. is the U.S. filing date if it is directly filed with the USPTO or when the application enters the national stage if it is an international application.