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, in order for an invention to be patentable, it must be of patentable subject matter, ie a kind of subject-matter that's eligible for patent protection, be novel (for example… (More on Patentability)