Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6273997 | Rosin/hydrocarbon resin size for paper | Susan M. Ehrhardt | 2001-08-14 |
| 6228219 | Rosin sizing at neutral to alkaline pH | Susan M. Ehrhardt | 2001-05-08 |
| 6033526 | Rosin sizing at neutral to alkaline pH | Susan M. Ehrhardt | 2000-03-07 |