Observations by third parties under the European Patent Convention
Under the European Patent Convention, any third party –i.e., essentially any person– may file observations on the patentability of an invention which is the subject of a European patent application or, after grant, subject of a European patent, especially to draw the attention of the European Patent Office to some relevant prior art documents. This is a form of public participation in the examination of patent applications.
Procedure
Observations by third parties can only be filed after the publication of a European patent application. They must be filed in writing by post or, alternatively, online. The filing of observations by third parties at the EPO is free of charge and, according to the current practice of the EPO, may be anonymous. The observations must state the grounds on which they are based. The grounds must be written in one of the official languages of the EPO, i.e. in English, French or German. The documentary evidences can be in any language, but the EPO may request a translation from the person filing the observations, if necessary. The observations are communicated to the applicant for or proprietor of the patent, who may comment on them.If the observations call into question the patentability of the invention, they must be taken into account in any proceedings pending before a department of the EPO until such proceedings have been terminated, i.e. they must be admitted to the proceedings. The EPO "has a duty vis-à-vis the public not to grant or maintain patents which it is convinced are not legally valid".