Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872892 | Air purifier | Seppo Vartiainen | 1989-10-10 |
| 4811724 | Air exhausting means | Kaarlo J. Korhonen, Jorma Pekkinen, Esa Sundberg, Arvi Tolmunen, Seppo Vartiainen +1 more | 1989-03-14 |