Helmut Karn
7Patents
2h-index
10Co-inventors
44Inventor score
Filing activity: Mar 11, 1975 → Oct 2, 1989
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5008398A | Preparation of p-nitrophenyl-imidazoles | Chemistry; Metallurgy | 3 | Expired |
| US4021442A | Production of 1-alkyl-5-nitroimidazoles | Chemistry; Metallurgy | 3 | Expired |
| US4242517A | Process for preparing 4-methyl-5[(2-aminoethyl)thiomethyl)]-imidazole | Chemistry; Metallurgy | 1 | Expired |
| US4278801A | Preparation of 5-hydroxymethylimidazoles | Chemistry; Metallurgy | 1 | Expired |
| US4866183A | Preparation of hexaarylbisimidazoles | Chemistry; Metallurgy | 1 | Expired |
| US4864030A | Preparation of 1-alkylimidazoles | Chemistry; Metallurgy | 0 | Expired |
| US4239895A | Process for producing 1-hydroxymethylimidazoles | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.