Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5630322 | Process and apparatus for heat treatment of workpieces by quenching with gases | Klaus Loser, Friedrich Preisser | 1997-05-20 |
| 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 | Peter Minarski, 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 | Peter Minarski, Friedrich Preisser | 1993-07-06 |
| 4869470 | Vacuum furnace for heat treatment of metallic workpieces | Fritz Kalbfleisch, Friedrich Preisser, Rolf Schuster | 1989-09-26 |
| 4867808 | Heat treating a metallic workpiece by quenching under cooling gas under above atmospheric pressure and specified circulation rate | Friedrich Preisser, Rolf Schuster | 1989-09-19 |
| 4717787 | Thermoelement for measurement of temperature in vacuum furnaces | Willi Freppon, Theo van Heijst | 1988-01-05 |
| 4682011 | Furnace for the partial heat treatment of work tools | Gerhard Hoffmann, Rudolf Bauer, Erwin Schumann | 1987-07-21 |