Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881292 | Housing attachment assembly with a plastic attachment tab and a clip | Richard Hoferer, Arthur Klotz, Gunter Trumpfheller | 1989-11-21 |
| 4874484 | Etching method for generating apertured openings or trenches in layers or substrates composed of n-doped silicon | Helmut Foell | 1989-10-17 |
| 4841239 | Method and measuring instrument for identifying the diffusion length of the minority charge carriers for non-destructive detection of flaws and impurities in semiconductor crystal bodies | Helmut Foell | 1989-06-20 |