Opposing an application to amend a patent specification

Section 75 before the court

If you want to oppose an amendment filed under section 75 before the court, you need to file a notice of opposition at the court. In the notice you need to set out clearly your reasons for opposing the amendment. You need to send us a copy of the notice and send a copy to anyone involved in the court proceedings. You need to do this within 14 days of the advertisement on our web site of the application to amend.

Section 75 before the comptroller and section 27 amendments

If you want to oppose an amendment filed under section 75 before the comptroller or an amendment filed under section 27, you need to complete and send us:

  • 2 copies of form 15 PDF document(18Kb) with the fee of GBP £50. You will need to pay a futher fee of GBP £350 later.
  • 2 copies of a statement setting out fully the facts of your case and what you want us to do

You need to file an opposition to an amendment under section 75 before the comptroller within 2 weeks of the advertisement on our website of the application to amend.

An opposition to an amendment filed under section 27 needs to be filed within 4 weeks of the advertisement on our website of the application to amend.