Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4990473 | Zirconyl phosphate ceramics, a process for their production and their use | Ernst Gugel | 1991-02-05 |
| 4853167 | Method for making lead pencils and colored pencils | Martin Bard, Rosemarie Rieger | 1989-08-01 |