Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879793 | Method of manufacturing turbine wheel disks with locally high internal compressive strains in the hub bore | Gerhard Roettger | 1989-11-14 |
| 4881030 | Method and apparatus for measuring and precisely locating internal tensile stresses in hardened regions of components by measuring coercive field strength and barkhausen noise amplitude | Gerhard Hofer, Dietmar Koch, Uenal Guenes | 1989-11-14 |