https://www.epo.org/en/service-support/faq/searching-patents/european-patent-register-and-federated-register/european-4
When will a document or correspondence become visible in the European Patent Register?
Publicly available outgoing communications are displayed in the Register on the day after the date of despatch.
Publicly available incoming communications are displayed in the Register as a rule one day after the document has been coded by the EPO. Please note that the date displayed alongside a document in the EP/UP All documents view is the date of receipt by the EPO.
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