https://www.epo.org/fr/node/446698
Basic definitions
A document
European patent application, published 18 months after filing with the EPO or 18 months after priority date
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A1 document
European patent application published with European search report -
A2 document
European patent application published without European search report (search report not available at the publication date) -
A3 document
Separate publication of the European search report -
A4 document
Supplementary search report
Corrected A document
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A8 document
Corrected title page of an A document, ie. A1 or A2 document. -
A9 document
Complete reprint of an A document, ie. A1, A2 or A3 document.
B document
European patent specification
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B1 document
European patent specification (granted patent) -
B2 document
New European patent specification (amended specification) -
B3 document
European patent specification (after limitation procedure)
Corrected B document
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B8 document
Corrected title page of a B document, ie. B1 or B2 document. -
B9 document
Complete reprint of a B document, ie. B1 or B2 document.
Publication date
Publication date of the original European patent document, ie. A1, A2, A3, B1, B2 or B3 document.
Issue date (of the correction)
Date of issue of the corrected version of a European patent document.
W1
Supplementary correction code indicating the first (1st) corrected version of a patent document
W2
Supplementary correction code indicating the second (2nd) corrected version of a patent document