The Unified Patent Court will be an international court with jurisdiction over patent disputes across multiple states. The Court will draw on multiple sources of law when making its rulings and is bound to follow relevant EU Law. Consequently it will be able to send queries (through preliminary references) to the Court of Justice of the EU on the correct interpretation of EU law. The Court of Justice of the EU is not an appellate court of the UPC, which has its own Court of Appeal.
Although the Court is not an EU institution, it is established under an international agreement that is presently only open to EU Member States. Our future relationship with the Court will therefore be subject to negotiation with our European Partners, in order to reflect the UK’s changing status, as we leave the EU. It would be wrong to set out unilateral positions in advance of those negotiations, which have not yet begun.