In United States patent law, in addition to satisfying the requirements for subject-matter eligibility, novelty, enablement, nonobviousness, and written description, a patent must comply with the definiteness requirement as specified in 35 U.S.C. §112(b).
One of the requirements for patentability under United States law is novelty, as prescribed by 35 U.S.C. § 102. Under § 102, an invention is eligible for patent if it is not anticipated by prior art.