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In order render the assessment of inventive step more objective, the EPO, acting as IPEA under PCT Chapter II, uses the so-called "problem-and-solution approach", which should be applied consistently.
GL/ISPE 13.08, GL/ISPE A13.08.1- GL/ISPE A13.08.9
In the problem-and-solution approach, there are three main stages:
The EPO applies option GL/ISPE A13.08.1 of the Appendix to Chapter 13 of the ISPE Guidelines.