If an amendment is made in order to clarify the meaning of a trade mark or to replace a registered trade mark with a corresponding technical term, the examining division needs to be particularly careful to ascertain that the amendment does not conflict with Art. 123(2). The composition of a trade-marked product may have changed over time.
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/h_iv_2_2_8.htm
Date retrieved: 17 May 2021