Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799263 | Speaking and hearing system for breathing apparatus | Peter Klein | 1989-01-17 |
| 4452242 | Respirator for use in pressure chambers | — | 1984-06-05 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799263 | Speaking and hearing system for breathing apparatus | Peter Klein | 1989-01-17 |
| 4452242 | Respirator for use in pressure chambers | — | 1984-06-05 |