An invention is a patentable invention if the invention, so far as claimed in a claim,—
(a) is a manner of manufacture within the meaning of section 6 of the Statute of Monopolies; and
(b) when compared with the prior art base—
(i) is novel; and
(ii) involves an inventive step; and
(c) is useful; and
(d) is not excluded from being a patentable invention under section 14 or 15.
Compare: Patents Act 1990 s 18(1) (Aust)