Admissibility of corrections 
Correction of linguistic errors, errors of transcription and other mistakes in any document filed with the EPO may in principle be requested as long as proceedings are pending before the EPO, provided that the request for correction has been filed without delay (G 1/12). However, during examination proceedings, it is to be noted that such requests for correction can be considered only until such time as the decision to grant has been handed over to the EPO’s internal postal service, for transmittal to the applicant (in written proceedings), or has been pronounced in oral proceedings (see G 12/91; date “to EPO postal service” printed at the bottom of Form 2006A).
Moreover, other temporary limitations apply to requests under Rule 139:
The request has to be made without undue delay after the error was discovered (G 1/12, J 16/08).
In case of correction of bibliographic data (e.g. priority, designation) or of procedural declarations (e.g. withdrawal), temporary limits may derive from the protection of the interests of the public. For instance, in the absence of any special circumstances, a request for correction of a priority claim by the addition of a first priority should be made sufficiently early for a warning to be included in the publication of the application (J 6/91). Otherwise, correction is possible only where it is apparent on the face of the published application that a mistake has been made (see also A-V, 3). An erroneous withdrawal of an application may only be corrected if, at the time when the request for correction was made, the public has not yet been officially notified of the withdrawal (J 25/03).
Limitations on requesting the correction of an error in a document filed with the EPO also exist where a decision has already been taken or a procedural phase terminated on the basis of the document containing the error. A request under Rule 139 cannot reinstate an applicant into an earlier procedural phase or reverse the effects of a decision already taken (J 3/01, see also H-VI, 3.1). It is therefore inadmissible in these cases.
Requests for correction under Rule 139 are dealt with by the department responsible for the proceedings. Correction of errors of this kind is the responsibility of the formalities officer, with the exception of errors in the description, claims and drawings (see Decision of the President of the EPO dated 12 December 2013, OJ EPO 2014, A6, Art. 1, point 22).

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