Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5020991 | Heating device operated by means of liquid fuel | Klaus Schaale, Johann Sperl | 1991-06-04 |
| 4923033 | Heating device, particularly automotive heating device, with an integrated muffler | Karl Panick, Friedrich Widemann, Johann Sperl, Johann Sondermeier | 1990-05-08 |