Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4841139 | Method for testing components of transparent material for surface irregularities and occlusions | Hubert Kurpiella, Bernhard Schneider | 1989-06-20 |
| 4822165 | Device for illuminating components of transparent material in testing for irregularities | Friedel Sinsel, Reinhold Bolz | 1989-04-18 |
| 4815844 | Device for testing components of transparent material for surface irregularities and occlusions | Friedel Sinsel, Reinhold Bolz | 1989-03-28 |
| 4798964 | Method and apparatus for the contactless measuring of the tread quality of railroad | Friedel Sinsel, Hubertus Kurpiella | 1989-01-17 |