At the beginning of June 2023, the legislative reform of the European patent system entered into force and the EU patent package came into force. Its elements are: the European patent with unitary effect and the Unified Patent Court. Poland joined the EU enhanced cooperation procedure aimed at creating a unitary European patent system, but did not sign the Agreement on a Unified Patent Court. Therefore, the question arises: if Poland has not joined the Agreement on the Unified Patent Court, what is the purpose of considering its assumptions? Well, its provisions are not indifferent to Polish entities applying for patents. For these reasons, the aim of this article is, after presenting the European patent with unitary effect and the functioning of the Unified Patent Court, to present the effects of the regulation in relation to Poland.