Where the proprietor of the patent resides abroad, the claim form for revocation in certain circumstances may be served out of the jurisdiction without permission1. Security for costs can be directed to be given by an applicant for revocation, but not by a respondent2. A patent can only be revoked in open court3, but it may be so revoked by consent or on affidavit evidence4. A proprietor may also surrender his patent5. The burden of proof in revocation proceedings is on the applicant for revocation6, but the respondent is entitled to begin7
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