Stéphane Vanhelle has been granted 11 US patents while listed as an inventor at Dav. The first was granted in 2008 and the most recent in January 2021. Stéphane Vanhelle ranks #435,149 of 4,157,543 US inventors in our database (top 10.5%). Patent records list Stéphane Vanhelle in Lannemezan, FR.