Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5864959 | Drawing triangle and/or protractor, in particular for blackboard use | Joern B. Johansen | 1999-02-02 |
| 5540462 | Cover device for subsequent mounting on softbound books | Helle Laursdahl | 1996-07-30 |