1. If the Statement of defence includes an assertion that the patent alleged to be infringed is invalid the Statement of defence shall include a Counterclaim against the proprietor of the patent for revocation of said patent in accordance with Rule 42 . The Counterclaim for revocation shall contain:
(a) an indication of the extent to which revocation of the patent is requested;
(b) one or more grounds for revocation, which shall as far as possible be supported by arguments of law, and where appropriate an explanation of the defendant’s proposed claim construction;
(c) an indication of the facts relied on;
(d) the evidence relied on, where available, and an indication of any further evidence which will be offered in support;
(e) an indication of any order the defendant
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3. Any action for the revocation of a patent shall be directed against the proprietor of the patent.
4. 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 substitution of the registered proprietor by the Rule 8.5 proprietor.