Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4822165 | Device for illuminating components of transparent material in testing for irregularities | Harald Schmalfuss, Friedel Sinsel | 1989-04-18 |
| 4815844 | Device for testing components of transparent material for surface irregularities and occlusions | Harald Schmalfuss, Friedel Sinsel | 1989-03-28 |