sule 66Regulations under the PCT Rule 66 Procedure before the International Preliminary Examining Authority. 66.1 Basis of the International Preliminary Examination (a) Subject to paragraphsRule 66.1: Application of the Civil Procedure Rules: Rule 66.2: Action on behalf of the Crown: Rule 66.3: Counterclaims, other additional claims, and set-off: Rule 66.4: