This case involves TRUMPF Laser UK Limited (plaintiff) accusing IPG Laser GmbH & Co. KG (defendant) of violating European Patent EP 2 951 625 related to an optical device for combining laser light. The plaintiff claims direct literal and equivalent infringement by the defendant, specifically targeting IPG's fiber lasers, known as the 'YLS-AMB' series, marketed across various European countries. The patent in question focuses on a specific configuration of optical fibers and laser outputs designed to manage the beam profile of laser outputs.

The plaintiff seeks multiple remedies, including injunctions, recalls, removal, destruction of infringing products, and a declaration of damages accounting from the date of patent grant. The defendant counters with a claim of patent invalidity. The court addressed issues surrounding the technological configurations comparable to the patent claims.