New EPO Information Disclosure Requirements Entering into Effect on January 1, 2011

According to the European Patent Convention's current Implementing Regulations, an inventor applying for a European patent may be invited by the European Patent Office ("EPO") to submit information on prior art that was taken into consideration in the examination of related national or regional patent applications. If the information is not provided in a timely fashion, the application will be deemed to have been withdrawn. These regulations have now been amended to make it compulsory to file a copy of the results of any search carried out in relation to the application or applications of which the European patent application claims priority. This requirement will enter into effect on January 1, 2011, and it will apply to European and international patent applications filed on or after that date.


In the case of a direct European patent application, the search results must be filed together with the application starting on January 1, 2011. In the case of an international patent application entering the European regional phase, the search results must be filed upon entry in the European phase, which, for example, would be mid-2012 for an international application filed in January 2011 (claiming a priority of January 2010) due to the 31-month deadline for entering the EP national phase. If the search results become available later, they must be supplied without delay.


Although the applicant is required to provide only the results of searches conducted with respect to the priority application, search results with respect to other applications relating to the same invention may still be requested, with the application deemed to have been withdrawn if the request is not complied with in a timely manner.


In practice, the new requirement is not as strict as it may appear at first sight. Although the prior art taken into consideration in the examination of the priority application should be included upon filing or filed upon entry in the regional phase, there will be no immediate adverse consequences if this is not done. Instead, once the European patent application enters the examination stage, the EPO will send an invitation to supply the information within a period of two months. The European patent application will be deemed to have been withdrawn only if no response to this invitation is filed.


Nonetheless, applicants or their attorneys seeking to maximize the efficiency of their foreign filing procedures would be well advised to assemble the information on prior art when instructing their European patent attorneys to file a new European patent application or to enter the European phase, because this would normally coincide with the filing of corresponding patent applications in other jurisdictions that have information disclosure requirements.


Translations of search results of an office of first filing in a language that is not an official language of the EPO is not required. Copies of the documents cited in a search result do not have to be filed. For European divisional applications, no search result information already filed with respect to the parent application has to be filed again. Thus, the new obligation has a reasonable scope.



Lawyer Contacts


For further information, please contact your principal Firm representative or one of the lawyers listed below. General email messages may be sent using our "Contact Us" form, which can be found at  


Dr. Dorothée Weber-Bruls




Dr. Martin Weber




Jones Day publications should not be construed as legal advice on any specific facts or circumstances. The contents are intended for general information purposes only and may not be quoted or referred to in any other publication or proceeding without the prior written consent of the Firm, to be given or withheld at our discretion. To request reprint permission for any of our publications, please use our "Contact Us" form, which can be found on our web site at The mailing of this publication is not intended to create, and receipt of it does not constitute, an attorney-client relationship. The views set forth herein are the personal views of the authors and do not necessarily reflect those of the Firm.