GL D IV 5.3 Filing of amended documents in reply to the notice of opposition

Amended documents must, provided that it is not irrelevant at the stage reached in the procedure, be as complete as possible and drawn up in such a way as to allow the European patent, where appropriate, to be maintained without further delay in the amended version.
These considerations apply also to auxiliary requests in which the patent proprietor proposes amendments for consideration by the opposition division only if the division is unable to grant the main request, for example that the opposition is to be rejected. In both cases, however, it will be more convenient in certain circumstances to determine first the form of the claims, leaving purely consequential amendments in the description to be dealt with later.
Care must be taken to ensure that any amendments do not offend against Art. 123(2) and (3) (see D‑V, 6, H‑IV, 4.3 and H‑V, 2 and 3). It must also be checked that the patent, by the amendments themselves, does not contravene the requirements of the EPC (with the exception of Art. 82, see D‑V, 2.2). For the form of amended documents, see H‑III, 2.2 to 2.4.
Proprietors' observations, and any amendments they make, are communicated to the opponent(s) by the formalities officer without delay for information. No time limit for reply is set.

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EPC Articles

EPO Guidelines - D Opposition and Limitation/Revocation Procedures

EPO Guidelines - E General Procedural Matters

EPO Guidelines - H Amendments and Corrections