Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5906973 | Process for cleaning vertical or inclined hard surfaces | Wolfgang Nierhaus | 1999-05-25 |
| 5507971 | Liquid cleaners for hard surfaces | Ulrich Eicken, Eva Kiewert, Herbert Fischer | 1996-04-16 |