Rule 25Counterclaim for revocation

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 wil
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