Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4988477 | An injection-blow molding method for manufacturing a colored polyester container | Jan Knol | 1991-01-29 |
| 4985187 | Method for coloring plastic granules by mixing with coloring agent at ambient temperature | Jan Knol | 1991-01-15 |
| 4681632 | Solid particulate coloring composition | Jan Knol | 1987-07-21 |
| 4484952 | Particulate coloring composition made by prilling | Jan Knol, Gooitsen Roest | 1984-11-27 |