Section 13
Non-patentable inventions.
(1) Notwithstanding the fact that they may be inventions within the meaning of section 12, the following shall not be patentable:
(a) discoveries, scientific theories and mathematical methods;
(b) plant or animal varieties or essentially biological processes for the production of plants or animals, other than man-made living micro-organisms, micro-biological processes and the products of such micro-organism processes;