Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4496729 | Catalysts for the production of 2-cyanopyrazine | Wolfgang Bergstein, Heinz Friedrich, Axel Kleemann, Gunther Prescher | 1985-01-29 |
| 4447612 | Catalysts for the production of 3-cyanopyridine | Heinz Friedrich, Johannes Heilos | 1984-05-08 |
| 4447614 | Process for the purification of nicotinic acid amide | Franz-Ludwig Dahm, Heinz Friedrich, Gunter Prescher | 1984-05-08 |
| 4447615 | Process for the purification of nicotinic acid amide I | Franz-Ludwig Dahm, Heinz Friedrich, Gunter Prescher | 1984-05-08 |
| 4419272 | Catalysts for the production of 2-cyanopyrazine | Bergstein Wolfgang, Heinz Friedrich, Axel Kleemann, Gunther Prescher | 1983-12-06 |
| 4332940 | Process for the production of 2,3-cycloalkenopyridines | Heinz Friedrich, Heribert Offermanns | 1982-06-01 |
| 4314064 | Process for the production of nicotinamide | Heinz Friedrich, Klaus Muller, Gerd Schreyer | 1982-02-02 |
| 4237299 | Process for the recovery of pyridine and 3-methylpyridine | Franz-Ludwig Dahm, Heinz Friedrich, Gerd Schreyer | 1980-12-02 |