Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8673114 | Method for producing a watermark element, watermark element, and also applications | Johannes Krul, Hendrik Van de Kamp | 2014-03-18 |
| 4557142 | Apparatus and method for real-time measurement of drilling fluid properties | Gary L. Hensley, Adrianus Groeneweg, Gerritt Stolk | 1985-12-10 |