Ann-Sofie Hallstrom has been granted 2 US patents while listed as an inventor at Eka Nobel Ab. The first was granted in 1998 and the most recent in December 1999. Ann-Sofie Hallstrom ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Ann-Sofie Hallstrom in Göteborg, SE.