The EPO as receiving Office will acknowledge receipt of a purported international application filed on paper using EPO Form 1031, which will be sent by post, as a rule within four working days. In it, the EPO will explicitly confirm the receipt of each document making up the international application and each accompanying item. However the EPO does not verify the number of sheets making up a given document.
The same procedure applies to international applications filed on electronic data carriers.
Upon receipt of paper documents purporting to be an international application, the EPO as receiving Office proceeds according to GL/RO, Chapter IV, paragraph 35.
For general information on the receipt of documents at the EPO and for information on acknowledgement of receipt by fax, see GL/EPO A-II, 3.1, which applies mutatis mutandis to international applications.
For international applications filed online using OLF, CMS or Web-Form Filing, receipt is acknowledged electronically following successful submission. The acknowledgement contains the identity of the receiving Office, the date and time of receipt, a reference or application number, a list of the files transmitted and, for online filings using OLF or CMS, a message digest, i.e. the message in compressed form.