The change from a process for the preparation of a product to the use of the product for a purpose other than previously claimed is not allowable (see T 98/85 and T 194/85).
On the other hand, the change in a claim from a method in which a certain product is used to a claim to the use of that product in performing that same method is allowable (see T 332/94).
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/h_v_7_4.htm
Date retrieved: 17 May 2021