The definiteness requirement of Section 112(b) of the Patent Act mandates that claims "particularly point[] out and distinctly claim[] the subject matter which the inventor or a joint inventor regards as the invention". The disagreement in Nautilus v Biosig centered on how much imprecision this definiteness requirement tolerates. In the Federal Circuit's view, a claim was indefinite only if it is "insolubly ambiguous" or not "amenable to construction". A unanimous Supreme Court criticised the standard as "more amorphous than the statutory definiteness requirement allows", citing lower courts' confusion, but also acknowledged that the Federal Circuit's "fuller explications of the term 'insolubly ambiguous' may come closer to tracking the statutory prescription" for definiteness.