Art. 27.-(3) Notwithstanding paragraphs (1) and (2), the proprietor of a patent shall have no right to prevent third parties from performing, without his authorization, the acts referred to in paragraphs (1) and (2) in the following circumstances:
(ii) where the act is done privately and on a non-commercial scale, provided that it does not significantly prejudice the economic interests of the proprietor of the patent;
(iii) where the act consists of making or using for purely experimental purposes or for scientific research;