Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8999015 | Apparatus for upgrading coal and method of using same | Roger B. Malmquist, Ray W. Sheldon | 2015-04-07 |
| 8671586 | Apparatus for upgrading coal and method of using same | Roger B. Malmquist, Ray W. Sheldon | 2014-03-18 |
| 8371041 | Apparatus for upgrading coal | Roger B. Malmquist, Ray W. Sheldon | 2013-02-12 |