Rolf Kretzschmar has been granted 6 US patents while listed as an inventor at Basf Se. The first was granted in 1982 and the most recent in October 1991. Rolf Kretzschmar ranks #779,687 of 4,157,543 US inventors in our database (top 18.8%). Patent records list Rolf Kretzschmar in Havelsee, DE.