The reason is that, while it costs 10 times as much to protect inventions with a patent in Europe as it does in the United States, in particular, because of translation costs, 25 of the 27 Member States want to create a European patent together; such a patent would cost less because it would be unitary.
En effet, alors que la protection des inventions par brevet coûte dix fois plus cher en Europe qu’aux États-Unis, notamment à cause des frais de traduction, 25 des 27 États membres veulent créer ensemble un brevet européen moins coûteux car unitaire.