Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6135431 | Scent cartridge | Mark Andrew Griesbach, Rita Hamann | 2000-10-24 |
| 6024782 | Layered gas filter media | Andre Freund, Klaus Ammann | 2000-02-15 |
| 5297544 | Respirator with inner half mask and pollutant indicator | Wolfgang May, Wolfgang Bather, Carl-Ernst van der Smissen | 1994-03-29 |