Admissibility of corrections 
Rule 140 is not available to correct errors in documents filed by a patent applicant or proprietor (G 1/10). Correction of such documents is admissible only under Rule 139 (see H‑VI, 2.1). After this point in time, in principle only errors in bibliographic data, printing errors in the publication concerning the decision to grant or to maintain the patent in amended form or formatting/editing errors may be corrected (see H‑VI, 3.2 and H‑VI, 3.3).
Since the final responsibility for the text of the patent lies with the applicant or patentee, itIt is histhe duty of the applicant or patentee to properly check all the documents making up the communication under Rule 71(3) (i.e. Form 2004 and the Druckexemplar), and the same applies to documents as proposed for maintenance in amended form (see Rules 71(5), 82(2)82(1) and 95(2), Rule 95 (3),Art. 113(2) and G 1/10).
However, requests for correction under Rule 139 of documents on which the patent is granted may under certain conditions be submitted in opposition (see H‑VI, 2.1.1, and H‑II, 3.2) and, mutatis mutandis, limitation proceedings (see also D‑X, 4.3).
Corrections of decisions are to be made by a decision at the reasoned request of one of the parties or by the EPO of its own motion. If the request for correction is refused, this decision must be reasoned (see T 850/95). These reasons must previously have been communicated to the requester (Art. 113(1)).

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