Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888128 | Paper-coating slips containing fluorescent brighteners | Friedhelm Muller, Werner Bieber, Joachim Konig, Udo Eckstein, Hans Theidel | 1989-12-19 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888128 | Paper-coating slips containing fluorescent brighteners | Friedhelm Muller, Werner Bieber, Joachim Konig, Udo Eckstein, Hans Theidel | 1989-12-19 |