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Within the context of a national or multilateral body of law, an invention is patentable if it meets the relevant legal conditions to be granted a patent. By extension, patentability also refers to the substantive conditions that must be met for a patent to be held valid. == Requirements == The patent laws usually require that, for an invention to be patentable, it must be: * Patentable subject matter, i.e., a kind of subject-matter eligible for patent protection * Novel (i.e. at least some aspect of it must be new) * Non-obvious (in United States patent law) or involve an inventive step (in European patent law) * Useful (in U.S. patent law) or be susceptible of industrial application (in European patent law) Usually the term "''patentability''" only refers to "substantive" conditions, and does not refer to formal conditions such as the "sufficiency of disclosure", the "unity of invention" or the "best mode requirement". Judging patentability is one aspect of the official examination of a patent application performed by a patent examiner and may be tested in post-grant patent litigation. Prior to filing a patent application, inventors sometimes obtain a patentability opinion from a patent agent or patent attorney regarding whether an invention satisfies the substantive conditions of patentability. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Patentability」の詳細全文を読む スポンサード リンク
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