https://www.epo.org/en/service-support/faq/myepo-services/third-party-observations/general-information/how-can-i-submit
How can I submit observations about a published application or granted patent?
By post or online:
- using the EPO's online filing software or Online Filing 2.0
- using the EPO's online form.
- via the European Patent Register.
Here is the EPO's Munich postal address:
European Patent Office
80298 Munich
Germany
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