Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9808657 | Directional valve and breathing mask with a directional valve | Michael Rosert, Dennis Leske, Harald Heyer | 2017-11-07 |
| 9492691 | Directional valve and respirator product with a directional valve | Michael Rosert, Dennis Leske, Harald Heyer | 2016-11-15 |