Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883052 | Protective breathing mask | Anna-Maria Weiss | 1989-11-28 |
| 4800190 | Filter material and process for the production thereof | — | 1989-01-24 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883052 | Protective breathing mask | Anna-Maria Weiss | 1989-11-28 |
| 4800190 | Filter material and process for the production thereof | — | 1989-01-24 |