GA B 31 Extension

With some European states, which are not a party to the EPC and thus not "included" in the designation "EP", the EPO has agreed a so-called "extension agreement". Pursuant to such agreement an applicant may, in the European phase, extend his application to any "extension state" on condition that all requirements are met. Valid extension requires, firstly, that on the international filing date the extension agreement was in force and, secondly, that this extension state was both a PCT contracting state at the filing date and was designated for a national patent in the international application.
The extension states listed below were already PCT contracting states on the date of entry into force of the extension agreement. Moreover, as from 1 January 2004, all PCT contracting states are automatically designated for a national and, where applicable, a regional patent (see point 116).
On 1 January 20142015 an extension agreement is in force with:
Bosnia and Herzegovina (BA) (since 1 December 2004); 
OJ 2004, 563, 619
OJ 2007, 406
OJ 2010, 10
Montenegro (ME) (since 1 March 2010). 
OJ 2010, 10
As to the extension of a European patent to the Republic of Montenegro (ME) following its Declaration of Independence on 3 June 2006 and before entry into force of the extension agreement on 1 March 2010, reference is made to the information in the Official Journal. 
OJ 2007, 406
The extension agreements with Albania (AL), Croatia (HR), Latvia (LV), Lithuania (LT), the former Yugoslav Republic of Macedonia (MK), Romania (RO), Serbia (RS) and Slovenia (SI) terminated when these states acceded to the EPC. The extension system continues to apply after the relevant termination date for all applications filed prior to the date on which the extension agreement concerned terminated.
OJ 2002, 463
OJ 2003, 1
OJ 2004, 481
OJ 2005, 299
OJ 2007, 637
OJ 2008, 507
OJ 2010, 96
OJ 2010, 394
A decision on the states for which extension is sought - and in accordance therewith timely payment of the extension fee(s) is due - need not be taken until the application has to enter the European phase (see points 558 ff).
OJ 2009, 603

10 references found.

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EPO Guidelines Foreword

EPO Guidelines - A Formalities Examination

EPO Guide for Applicants, part II Int.

EPO Guide for Applicants, part II Int. - A General Overview

EPO Guide for Applicants, part II Int. - B The EPO as a PCT receiving Office

EPO Guide for Applicants, part II Int. - E Euro-PCT procedure before the EPO as designated or elected Office