Under the applicable national provisions of the extension states, the extension fee must be paid
If the fee for an extension state has not been paid within the corresponding period, the applicant can still pay the extension fee together with a 50% surcharge
If the applicant fails to pay the extension fee during the basic and the grace period, the request for extension is deemed to be withdrawn. No communication of loss of rights is issued after expiry of either the basic or the grace period in these cases. However, a noting of loss of rights related to the failure to pay the designation fee pursuant to Rule 39(2) or Rule 159(1)(d) will draw the applicant’s attention to the lack of payment of the extension fee, where appropriate, triggering the time limit mentioned in item (b) above.
For applications in relation to which the (basic) period for payment of extension fees expired before 1 January 2010, the option of validly paying the fees plus surcharge during the grace period does not exist. In these cases the failure to pay in due time can only be remedied by filing a request for further processing according to Art. 121 and Rule 135, following a communication of loss of rights regarding the designation fee.
If no loss of rights occurs under Rule 39 and the extension fee has not been paid within the applicable basic time limit (Rules 39(1), Rule 17(3), Rule 36(4) and Rule 159(1)(d)), no communication under Rule 112(1) is issued and the request for extension is deemed to be withdrawn without the possibility of late payment with surcharge unless a period of two months from expiry of the basic period has not expired (see below). However, if:
then the EPO will notify the applicant of the loss of rights with regard to the designations in question or the application according to Rule 112(1). This communication according to Rule 112(1) will also draw the applicant's attention to the possibility of late payment of any extension fees not paid in the basic period.
In this case, the applicant may then request further processing according to Art. 121 and Rule 135 in respect of the deemed withdrawal of the application or of the designations. Along with further processing in respect of the unpaid designation fee(s), any unpaid extension fees may still be paid with a surcharge of 50% of the relevant fee(s) within a (non-extendable) period of two months after notification of the communication according to Rule 112(1) (see the Notice from the EPO dated 2 November 2009, OJ EPO 2009, 603).
If the basic period for payment of extension fees expires on or after 1 January 2010 and the fee for an Extension State has not been paid within that period, the applicant can pay the extension fee in combination with a 50% surcharge within two months of expiry of the basic period (see the Notice from the EPO dated 2 November 2009, OJ EPO 2009, 603). This applies regardless of whether (the) designation fee(s) is/are paid on time (within the basic period) or by means of further processing.