Section 59(1) of the Code provides:
"(1) 'Invention' means an idea of an inventor, which permits in practice the solution to a specific problem in the field of technology;
(2) An invention may be, or may relate to, a product or process;
(3) The following, notwithstanding they are inventions within the meaning of subsection (1), 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 micro-biological processes and the products of such processes;
(c) schemes, rules or methods for doing business, performing purely mental acts or playing games;
(d) methods for the treatment of the human or animal body by surgery or therapy, and diagnostic methods practised on the human or animal body;
Provided, however, that this paragraph shall not apply to the products used in any such methods."
