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 proprietor shall as soon as practicable after service of the Statement for revocation apply to the Court pursuant to Rule 305.1(c)  for the substituti
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6. For the purposes of proceedings pursuant to Rules 42 and 61 in relation to a European patent, the person shown in the national patent register [Rule 8.5(a)] as the proprietor shall be treated as such for each Contracting Member State or, as far as no such person is registered in a national patent register, the last person shown recorded as proprietor in the European Patent Register kept by the European Patent Office.
5. Subject to paragraph 6, for the purposes of proceedings under these Rules:
(a) in relation to the proprietor of a European patent, the person entitled to be registered as proprietor under the law of each Contracting Member State in which such European patent has been validated shall be treated as the proprietor whether or not such person is in fact recorded in the register of patents maintained in such Contracting Member State (hereinafter “national patent register”); and
(b) in relation to the applicant for a European patent, the person entitled to be registered as applicant whether or not such person is in fact recorded as such in the European Patent Register kept by the European Patent Office.
1. The Court may, on application by a party, order a person to:
(c) be substituted for a party.