Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868459 | Method of and circuit for brightness and temperature-dependent control of an LCD illuminator | Ludwig Dennerlein | 1989-09-19 |
| 4832454 | Control circuit for a liquid crystal display unit | — | 1989-05-23 |