GL G VII 5 Problem-solution approach

In order to assess inventive step in an objective and predictable manner, the so-called "problem-solution approach" is applied.
In the problem-solution approach, there are three main stages:
(i)determining the "closest prior art", 
(ii)establishing the "objective technical problem" to be solved, and 
(iii)considering whether or not the claimed invention, starting from the closest prior art and the objective technical problem, would have been obvious to the skilled person. 
5.1 Determination of the closest prior art
5.2 Formulation of the objective technical problem
5.3 Could-would approach
5.4 Claims comprising technical and non-technical features

Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/g_vii_5.htm

Date retrieved: 17 May 2021

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EPO Guidelines - G Patentability

Case Law Book: I Patentability

Case Law Book: V Priority