[(1) If in any proceedings before *** a High Court for the revocation of a patent under section 64 and section 104, *** the validity of any claim of a specification is contested and that claim is found by *** the High Court to be valid, *** the High Court may certify that the validity of that claim was contested in those proceedings and was upheld.]
(2) Where any such certificate has been granted, then, if in any subsequent suit before a court for infringement of that claim of the patent or in any subsequent proceeding for revocation of the patent in so far as it relates to that claim, the patentee or other person relying on the validity of the claim obtains a final order or judgment in his favour, he shall be entitled to an order for the payment of his full costs, charges and expenses of an incidental to any such suit or proceeding properly incurred so far as they concern the claim in respect of which the certificate was granted, unless the court trying the suit or proceeding otherwise directs:
Provided that the costs as specified in this sub-section shall not be ordered when the party disputing the validity of the claim satisfies the court that he was not aware of the grant of the certificate when he raised the dispute and withdrew forthwith such defence when he became aware of such a certificate.
[(3) Nothing contained in this section shall be construed as authorising the courts *** hearing appeals from decrees or orders in suits for infringement or petitions for revocation, as the case may be, to pass orders for costs on the scale referred to therein.]