Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5472485 | Use of zirconium salts to improve the surface sizing efficiency in paper making | Dan V. Calcar, Bernard W. Wolff | 1995-12-05 |
| 5460645 | Use of zirconium salts to improve the surface sizing efficiency in paper making | Dan van Calcar, Bernard W. Wolff | 1995-10-24 |