Where the translation of a document is required, the European Patent Office may require that a certificate that the translation corresponds to the original text be filed within a period to be specified. If the certificate is not filed in due time, such document shall be deemed not to have been filed, unless otherwise provided. 

In written proceedings before the European Patent Office, the requirement to use the written form shall be satisfied if the content of the documents can be reproduced in a legible form on paper.