4.2.002Once a European patent application has been filed, no amendments extending beyond its content as filed may be made to the description, the claims or the drawings. Hence you are not allowed to add examples or features to the application documents at a later date to remedy deficiencies in the disclosure. Nor are you allowed to extend the subject-matter of the claims, e.g. by omitting certain features, unless there is clear support for such amendment in the application as filed. You must therefore make sure that the claims as filed clearly and accurately identify the invention that you want to protect (see also point 5.4.021).