The renewal fee for the third year can always be validly paid until thefalls
due date underaccording to Rule 51(1) EPC
. If, however, according to Rule 51(1) EPC
the renewal fee for the third year fell due within the 31-month time limit for entry into the European phase, the due date is deferred and the fee may be paid without surcharge up to expiry of the 31-month time limit. In that case the grace period of six months within which the renewal fee can still be validly paid, subject to payment of a 50% additional fee, is computed from the date of expiry of the 31-month time limit.