Questão jurídica principal
Whether Swiss courts had jurisdiction over negative declaratory claims concerning alleged infringement of foreign patent parts by claimants domiciled in Switzerland.
Decisão extraída
No. For a negative declaratory claim, Article 2 LugÜ points to the defendant's domicile; the claimants' Swiss domicile does not create a claimant forum.
Fundamentação extraída
The general rule actor sequitur forum rei applies. A plaintiff forum cannot be derived from the claimant's domicile merely because the action is framed negatively. Only exceptional circumstances could justify departure, which were absent here.