https://www.epo.org/en/service-support/faq/myepo-services/online-filing-20/user-reference/which-are-characters-allowed-0
Which are the characters allowed in the user reference field for EP applications?
The user reference can be up to 25 characters long and may include the following characters:
âäàãáåçñ[.<(+!&éêèëíîìïß]$*);^- /ÂÁÄÀÃÅÇѦ,%_>?øÈÊÉËÌÍÎÏ`:@’="Øabcdefghijklmnopqrstuvwxyz«»öýþ±°æ,¤Æ¿Ý£¥.©§¶¼½¾¹²³¬|¨'´{}ABCDEFGHIJKLMNOPQRSTUVWXYZôöóòõûüùúÿ\ÖÔÒÓÕ0123456789ÛÙÜÚÅ ª°¿®¯×Þ÷
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