Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
HK

Helmut Karn — 6 Patents

Basf Se: 6 patents #2,778 of 13,826Top 25%
Ludwigshafen, DE: #531 of 1,722 inventorsTop 35%
Overall (All Time): #779,687 of 4,157,543Top 20%
6 Patents All Time
Helmut Karn has been granted 6 US patents while listed as an inventor at Basf Se. The first was granted in 1980 and the most recent in April 1991. Helmut Karn ranks #779,687 of 4,157,543 US inventors in our database (top 18.8%). Patent records list Helmut Karn in Ludwigshafen, DE.

Patents per Year

Patents granted per year, 1980 to 1991Bar chart with a peak of 2 patents in 1980.peak 21980: 2 patents19801981: 1 patents19811989: 2 patents19891991: 1 patents1991

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #TitleCo-InventorsDate
5008398 Preparation of p-nitrophenyl-imidazoles Hermann Koehler, Klaus Ebel, Christof Taubitz 1991-04-16
4866183 Preparation of hexaarylbisimidazoles Uwe Kempe, Toni Dockner, Thomas Bluemel, Reinhold J. Leyrer, Thomas Loerzer 1989-09-12
4864030 Preparation of 1-alkylimidazoles Hermann Koehler, Toni Dockner 1989-09-05
4278801 Preparation of 5-hydroxymethylimidazoles Uwe Kempe, Toni Dockner, Anton Frank 1981-07-14
4242517 Process for preparing 4-methyl-5[(2-aminoethyl)thiomethyl)]-imidazole Toni Dockner, Anton Frank, Uwe Kempe, Matthias Wetzler 1980-12-30
4239895 Process for producing 1-hydroxymethylimidazoles Toni Dockner, Anton Frank, Uwe Kempe, Matthias Wetzler 1980-12-16