Section 9

The High Court shall have power, upon the application of any person who alleges that his interests have been prejudicially affected by the issue of a certificate of registration, to declare that the exclusive privileges and rights conferred by that certificate of registration have not been acquired on any of the grounds mutatis mutandis upon which the United Kingdom patent might be revoked under the law for the time being in force in the United Kingdom. Such grounds shall be deemed to include the manufacture, use or sale of the invention in Singapore before the priority date applicable to the patent in the United Kingdom, but not to include the manufacture, use or sale of the invention in Singapore by some person or persons after the priority date applicable to the patent in the United Kingdom and before the date of the issue of the certificate of registration under section 5.