Rule 42Action to be directed against the patent proprietor
1. Any action for the revocation of a patent shall be directed against the proprietor of the patent.
2. If the action for revocation is directed against the proprietor in accordance with Rule 8.6 (“the registered proprietor”) but the registered proprietor is not a proprietor within the meaning of Rule 8.5(a) or (b) (“the Rule 8.5 proprietor”) each such registered (…)