Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5901653 | Apparatus including a two stage vortex chamber for burning waste material | Joao Augusto Birkhan | 1999-05-11 |
| 5746142 | Horizontally pivoted system grate for a furnace | Joao Augusto Birkhan | 1998-05-05 |
| 5588381 | Method and system for burning waste materials | Joao Augusto Birkhan | 1996-12-31 |