Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5714644 | Process and catalyst for the selective hydrogenation of butynediol to butenediol | Matthias Irgang, Volkmar Menger, Ernest Miesen, Peter Stops | 1998-02-03 |
| 4902828 | Recovery of aqueous glyoxylic acid solutions | Gerhard Wickenhaeuser, Bernd Heida, Leopold Hupfer | 1990-02-20 |
| 4851584 | Preparation of carbonyl compounds | Leopold Hupfer, Harald Schultheiss | 1989-07-25 |
| 4814513 | Preparation of carbonyl compounds | Heinz Engelbach, Leopold Hupfer, Harald Schultheiss, Michael Jolyon Sprague | 1989-03-21 |
| 4728435 | Decolorization of aqueous glyoxal solutions | Guenther Mueller, Rolf Ramsteiner, Leopold Hupfer | 1988-03-01 |
| 4698434 | Preparation of hydroxymethylimidazoles | Leopold Hupfer | 1987-10-06 |
| 4521632 | Purification of aqueous glyoxal solutions | Gerhard Wickenhaeuser, Bernd Heida, Leopold Hupfer | 1985-06-04 |
| 4450277 | Preparation of 1-substituted imidazoles | Leopold Hupfer | 1984-05-22 |
| 4377696 | Preparation of 4-methylimidazoles | — | 1983-03-22 |