Key legal question
Whether the Handelsgericht had jurisdiction under Art. 6(1) LugÜ for the negative declaratory claim concerning foreign patent parts
Extracted holding
No. After the parallel claims of the other plaintiffs were no longer at issue, there were no co-defendants remaining whose joinder could support Art. 6(1) LugÜ.
Extracted reasoning
The special forum for multiple defendants presupposes that several persons are sued together on the relevant claim. That premise failed here.