 In addition to utility and novelty, the third restriction on patentability is non-obviousness. United States patent law requires that the invention not be obvious to one ordinarily skilled in the relevant art at the time the invention was made. A hypothetical individual is constructed and the question is asked, “Would this invention be obvious to an expert in the relevant field?” If it would be obvious to this imaginary individual then the patent claim fails the test (35 U.S.C. §103).