The document discusses various international treaties and agreements relating to patent law harmonization, including requirements for patentable utility. It outlines the Paris Convention, Patent Cooperation Treaty, Patent Law Treaty, TRIPS agreement, and NAFTA; noting they promote national treatment, set standards for international patent applications, and prohibit additional form and content requirements beyond what is specified. However, countries still have flexibility in applying substantive patentability conditions, though not in a way that imposes extra filing requirements.