Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6129095 | Process for removing dust deposits from ductwork | Wilhelm Lilliehook | 2000-10-10 |
| 5860187 | Cleaning system for removing dust deposits from ductwork | Wilhelm Lilliehook | 1999-01-19 |