T 0799/24 (Optimisation of vehicle body joint position/JFE STEEL CORPORATION) vom 21.08.2025

Inventive step - main request
Inventive step - (yes)

In the board's view, the formulation in claim 1 of the main request that additional welded point(s) is/are "to be added" to the automotive body to improve its stiffness during driving at least implicitly specifies a further technical use (reasons, point 4.4).
The board considers that it is implicit from claim 1 that the additional welded points of which the locations are determined will be added to the automotive body (reasons, points 37 and 43). The technical effect is therefore considered to be achieved by the distinguishing features over the whole scope claimed.
The appellant considered the objective technical problem as being how "to design an automotive body in which the stiffness of the automotive body during driving is improved" (reasons, point 25).
One distinguishing features of claim 1 of the main request having regard to the disclosure of document D1 specifies that the load applied has a different magnitude and direction at each joining portion (reasons, points 32.1 and 23).
In the board's view, since the use of the analysis results is defined in the claim as being "for automotive body designing", leaving it open which further steps, technical or not, are performed with the analysis results, a potential further selection of a particular automotive body might also be based on the visual characteristics or appearance of the automotive body. However, the board is of the opinion that the selection of the automotive body is, in addition, also restricted to the selected additional welded points to be added to the automotive body (reasons, point 34.1).
The board notes that the optimisation analysis on the welding candidates applies at least one of the load, of which magnitude and direction are different at each joining portion. An additional welded point or an additional welded location that satisfies the optimization analysis conditions, including maximising absorbed energy, is selected (reasons, point 36).
The analysis results used in the automotive body designing are, for example, "automotive body displacement amount". The possible use by the user of the displayed analysis results might be a cognitive exercise such as selecting the automotive body corresponding to the lowest displacement amount (see Figures 19A to 19D and 20A to 20D of the application as filed and decision G 1/19, point 138), but the board considers that the step of selecting the additional welded points contributes to the technical character of the invention (reasons, point 44).
The board further notes that the additional welded points of which the locations are determined or selected are "to be added to the automotive body" ("to improve the stiffness of the automotive body during driving"). In the board's view this wording at least implicitly specifies a further technical use (see decision G 1/19, points 124 and 137) (reasons, point 37).
The board considers that, even if the automotive body was a "prototype" and the additional welded points were added to this "prototype", this "prototype" would still be a physical object having at least some of the features of an automotive body (reasons, point 45).
The board notes that the decision of the Enlarged Board of Appeal G 1/19, point 111 requires a simulation to be "accurate enough" or a simulation that reflects "reality" "accurately enough". In the present case, the automotive model constituted by the automotive body frame model and the chassis model together with the welded points at the joining portion(s) is considered to reflect an automotive body (as "reality") "accurately enough" (reasons, point 46).