Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860097 | Transformation circuit | Wolfgang Hartnack, Herbert Schutze | 1989-08-22 |
| 4807033 | Method for correcting television signals | Wolfgang Hartnack, Dietrich Westerkamp | 1989-02-21 |