Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8921564 | Basic bisazo compounds | Ludwig Hasemann, Friedrich Lehr, Martin Oberholzer | 2014-12-30 |
| 7686851 | Concentrated dye solutions | — | 2010-03-30 |
| 7183409 | Basic mono- and bisazo compounds | Friedrich Lehr, Reinhard Pedrazzi | 2007-02-27 |