The request for extension or validation may be withdrawn at any time. It will be deemed withdrawn if the European patent application or the Euro-PCT application is finally refused, withdrawn or deemed withdrawn. A separate communication is not issued to the applicant. Validly paid extension or validation fees are not refunded.
Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/a_iii_12_3.htm
Date retrieved: 17 May 2021