Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867674 | Method and device for process heat generation | Jakob Keller | 1989-09-19 |
| 4850194 | Burner system | Cornel Fuglistaller, Jakob Keller | 1989-07-25 |
| 4838783 | Dual burner facility with a fuel oil atomizer | Cornel Fuglistaller, Jakob Keller | 1989-06-13 |