Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5133347 | Mouthpiece valve for breathing equipment | — | 1992-07-28 |
| 4840170 | Self-rescuer apparatus | Klaus-Dieter Dahrendorf, Wilfried Hoffman | 1989-06-20 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5133347 | Mouthpiece valve for breathing equipment | — | 1992-07-28 |
| 4840170 | Self-rescuer apparatus | Klaus-Dieter Dahrendorf, Wilfried Hoffman | 1989-06-20 |