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Guidelines for Examination

 
 

9.2.4 Intermediate documents

Documents published on dates falling between the date of filing of the application being examined and the date of priority claimed, or the earliest priority if there is more than one (see B‑VI, 5.2 and B‑XI, 4), should be denoted by the letter "P". The letter "P" should also be given to a document published on the very day of the earliest date of priority of the patent application under consideration. The document category "P" is always accompanied by a symbol indicating the relevance of the document according to B‑X, 9.2.1 or 9.2.2, for example: "P, X"; "P, Y"; or "P, A".

References

Rule 61(3)