1.2.2 Priority claim of a divisional application 

A priority claimed in the parent application also applies to the divisional application, provided that the parent application's priority claim has not been lost or withdrawn by the date the divisional application is filed; it is not necessary to claim it formally a second time. The priority claim can be withdrawn in respect of the divisional application (F‑VI, 3.5, E‑VIII, 8.2 and E‑VIII, 8.3). However, this will have no effect on the parent application's priority claim. Similarly, any withdrawal of the priority claimed in the parent application after the divisional application's filing has no effect on the latter's priority claim.

Where the parent application claims multiple priorities under Art. 88(2), the applicant may claim fewer priorities in respect of the divisional application. To do so, they must file a clear and unambiguous withdrawal of the priority claim or claims in question in respect of the divisional application (see the notice from the EPO dated 12 November 2004, OJ EPO 2004, 591). In the absence of such a withdrawal, all priorities that have not lapsed in respect of the parent application when the divisional is filed also remain valid with respect to that application. What is more, all such priority claims remain valid for the divisional, even if the applicant provides an incorrect or incomplete priority claim when filing it.

If a certified copy and a translation of the previous application, if applicable (see A‑VII, 3.3), have been filed in respect of the parent application before the divisional application is filed, it is not necessary to file the priority document and any translation again in respect of the divisional. The EPO makes a copy of these documents and places them in the divisional application's file (see the decision of the President of the EPO dated 12 July 2007, Special edition No. 3, OJ EPO 2007, B.2).

If, when the divisional application is filed, a priority document has not been filed in respect of the parent application, it must be filed in respect of the divisional application and, if the priority claim of the parent application's remaining subject-matter is to be retained, in respect of the parent application also. Applicants can also inform the EPO, within the time limit set for filing priority documents in the divisional application proceedings, that they have meanwhile submitted these documents in respect of the parent application. If the divisional application's subject-matter relates only to some of the priorities claimed in the parent application, priority documents in respect of the divisional application need be filed for those priorities only.

This applies also as regards indicating the file number of the previous application. For the time limits for indicating the file number and for filing the priority documents, see A‑III, 6.5, A-III, 6.5.3 and A-III, 6.7 et seq.