Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9140495 | Rotary biomass dryer | David N. Smith | 2015-09-22 |
| 8667706 | Rotary biomass dryer | David N. Smith | 2014-03-11 |
| 7144558 | Wood gasification apparatus | David N. Smith | 2006-12-05 |