Casalonga UPC rules of procedure
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Rule 5Lodging of an Application to opt out and withdrawal of an opt-out

1. The proprietor of a European patent (including a European patent that has expired) or the applicant for a published application for a European patent (hereinafter in this Rule 5 an “application”) who wishes to opt out that patent or application from the exclusive competence of the Court in accordance with Article 83(3) of the Agreement [1] shall lodge an Application (hereinafter in this Rule 5 an “Application to opt out”) with the Registry.

(a) Where the patent or application is owned by two or more proprietors or applicants, all proprietors or applicants shall lodge the Application to opt out. Where the person lodging an Application to opt out is not recorded as the proprietor or applicant in the registers referred to in Rule 8.5(a) and (b), [2] respectively, the person shall
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(3) Unless an action has already been brought before the Court, a proprietor of or an applicant for a European patent granted or applied for prior to the end of the transitional period under paragraph 1 and, where applicable, paragraph 5, as well as a holder of a supplementary protection certificate issued for a product protected by a European patent, shall have the possibility to opt out from the exclusive competence of the Court. To this end they shall notify their opt-out to the Registry by the latest one month before expiry of the transitional period. The opt-out shall take effect upon its entry into the register.

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.