These are a more generalised form of discoveries, and the same principle as set out in G‑II, 3.1 applies. For example, the physical theory of semiconductivity would not be patentable. However, new semiconductor devices and processes for manufacturing these may be patentable.[Art. 52(2)(a); ]
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/g_ii_3_2.htm
Date retrieved: 17 May 2021