Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D569010 | Retaining wall block | Todd P. Strand | 2008-05-13 |
| D552258 | Retaining wall block | Todd P. Strand | 2007-10-02 |
| 6379445 | Paints and printing inks containing modified carbon blacks | Karin Otto | 2002-04-30 |
| 6159275 | Paints and printing inks containing modified carbon blacks | Karin Otto | 2000-12-12 |