Question juridique clé
Whether the appellant could rely on a newly filed US patent as evidence on appeal
Solution extraite
The US patent was an inadmissible new factual allegation/evidence because the appellant did not show why it could not have been submitted with due diligence in the cantonal proceedings.
Motifs extraits
The special novum rule for technical matters is exceptional and applied strictly; the appellant's claim that it did not possess the patent and that the court or expert might have obtained it ex officio was insufficient.