In case of death of any applicant for the registration of a trademark after the date of his application and before the trademark has been entered in the register, the Registrar may, on request on form TM-M and on proof of the applicant's death and on proof of the transmission of the interest of the deceased person, substitute in the application, the name of successor in interest in place of the name of such deceased applicant, and the application may proceed thereafter as so amended.