Section 47. In section 64 of the principal Act, in sub-section (1), for the words "on the petition of any person

47. In section 64 of the principal Act, in sub-section (1), for the words "on the petition of any person interested or of the Central Government or on a counter-claim in a suit for infringement of the patent, be revoked by the High Court", the words "be revoked on a petition of any person interested or of the Central Government by the Appellate Board or on a counter-claim in a suit for infringement of the patent by the High Court" shall be substituted.