Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8679325 | Processing asphaltene-containing tailings | Willem P. C. Duyvesteyn, Julian Kift | 2014-03-25 |
| 8529687 | Oxidation of asphaltenes | Willem P. C. Duyvesteyn | 2013-09-10 |
| 8354067 | Processing asphaltene-containing tailings | Willem P. C. Duyvesteyn, Julian Kift | 2013-01-15 |
| 7909989 | Method for obtaining bitumen from tar sands | Willem P. C. Duyvesteyn, James S. Hanson | 2011-03-22 |
| 7811444 | Oxidation of asphaltenes | Willem P. C. Duyvesteyn | 2010-10-12 |
| 7585407 | Processing asphaltene-containing tailings | Willem P. C. Duyvesteyn, Julian Kift | 2009-09-08 |