In this rule and in rules 37 to 41—

• “renewal date” has the meaning given in rules 37(2) to (4) and 38(3);

• “renewal fee” means the fee prescribed in respect of a renewal date;

• “renewal period” means the period prescribed by rule 37 or 38 for the payment of a renewal fee.

If the renewal fee is not paid before the end of the renewal period, the patent shall cease to have effect at the end of the renewal date.

Patents Form 12 must be filed before the end of the renewal period.

But where payment is made under section 25(4) or section 28(3), Patents Form 12 must accompany the renewal fee and the prescribed additional fee.

On receipt of the renewal fee the comptroller must issue a certificate of payment.