There is no administrative fee to pay for a transfer of opponent status (T 261/03 of 24 November 2005 date: 2005-11-24; T 413/02).

In the case of a transfer of an opposition from a deceased natural opponent to his or her heir, the heir can only be ascertained by reference to the particular national laws of succession applicable to the estate of the deceased opponent. It follows that the person seeking to establish that they have the right to succeed to an opposition must produce satisfactory evidence that he, she or they have done so under the relevant national law (T 74/00).