Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5372655 | Method for the treatment of alloy steels and refractory metals | Friedrich Preisser, Albrecht Melber, Klaus Zimmerman | 1994-12-13 |
| 5362031 | Method and apparatus for the automatic monitoring of operating safety and for controlling the progress of the process in a vacuum heat-treatment oven | Paul Heilmann, Friedrich Preisser | 1994-11-08 |