EU's patentsystem lider imidlertid af mange mangler, der forhindrer etablering af en fælles patentbeskyttelse, men også af utilstrækkelig udvikling af det indre marked, som betyder mindre retlig sikkerhed for opfindere og innovative virksomheder.
The EU patent system, however, suffers from many deficiencies, preventing the establishment of unitary patent protection, but also the development of the internal market, thereby reducing legal certainty for inventors and innovative firms.