649. Amendment of specification by the court
In any action for infringement of a patent or proceeding before the Court for a revocation of a patent the Court may by order allow the patentee to amend his or her specification by way of disclaimer in such manner, and subject to such terms as to costs, advertisements or otherwise, as the Court may think fit:
Provided that no amendment shall be so allowed that would make the specification, as amended, claim an invention substantially larger than, or substantially different from, the invention claimed by the specification as it stood before the amendment, and where an application for such an order is made to the Court notice of the application shall be given to the Registrar, and the Registrar shall have the right to appear and be heard, and shall appear if so directed by the Court.