Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882287 | Process for indicating the presence of toxic substances in air that is supplied to a personnel-occupied space | Heinz Holter, Heinrich Igelbuscher, Heinrich Gresch, Heribert Dewert | 1989-11-21 |