https://www.epo.org/en/service-support/faq/myepo-services/third-party-observations/technical-issues/when-can-i-file-third
When can I file third-party observations using the web form?
You can file third-party observations using the web form only as from the day after the EP publication date. If you wish to submit observations before that date, please file them in another way.
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