Clause 69

In proceedings for infringement of a patent, damages shall not be awarded and no order shall be made for an account of profits against a defendant who proves that at the date of the infringement he was not aware, and had no reasonable grounds for supposing, that the patent existed; and a person shall not be taken to have been so aware or to have had reasonable grounds for so supposing by reason only of the application to a product of the word “patent” or “patented”, or any word or words expressing or implying that a patent has been obtained for the product, unless the number of the patent accompanied the word or words.

In proceedings for infringement of a patent the court or the Registrar may, if it or he thinks fit, refuse to award any damages or make any such order in respect of an infringement committed during any further period specified under section 36(3), but before the payment of the renewal fee and any additional fee prescribed for the purposes of that subsection.

Where an amendment of the specification of a patent has been allowed under any of the provisions of this Act, no damages shall be awarded in proceedings for an infringement of the patent committed before the decision to allow the amendment unless the court or the Registrar is satisfied that the specification of the patent as published was framed in good faith and with reasonable skill and knowledge.