Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4846668 | Heating stove which includes a pyrolysis gasifier | Frederick P. Beierle, Birdell T. Boyer | 1989-07-11 |
| 4799437 | Heating stove which includes a pyrolysis gasifier | Frederick P. Beierle, Birdell T. Boyer | 1989-01-24 |