Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6776854 | Process and apparatus for the partial thermochemical vacuum treatment of metallic workpieces | Udo Bardelmeier | 2004-08-17 |
| 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 |
| 5225142 | 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 | 1993-07-06 |