The search does not normally take into consideration documents published after the filing date of the application. However, some extension is necessary for specific purposes, as is apparent from B‑VI, 2 to B-VI, 4, and B-VI, 5.3.
Certain other situations may occur in which a document published after the filing date is relevant; examples are a later document containing the principle or theory underlying the invention, which may be useful for a better understanding of the invention, or a later document showing that the reasoning or the facts underlying the invention are incorrect (see Art. 84 and F‑IV, 6.3). The search should not be extended for this purpose, but documents of this nature known to the examiner could be selected for citation in the report (see B‑X, 9.2.5).