Rule 50 – Documents filed subsequently - The European Patent Convention, Implementing Regulations – to the Convention on the Grant of European Patents, Part III – Implementing Regulations to Part III of the Convention, Chapter II – Provisions governing the application
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All documents other than those making up the application shall generally be typewritten or printed. There shall be a margin of about 2.5 cm on the left-hand side of each page.
Documents filed after filing the application shall be signed, with the exception of annexed documents. If a document has not been signed, the European Patent Office shall invite the party concerned to do so within a time limit to be specified. If signed in due time, the document shall retain its original date of receipt; otherwise it shall be deemed not to have been filed.