Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4811724 | Air exhausting means | Erkki Aalto, Kaarlo J. Korhonen, Jorma Pekkinen, Esa Sundberg, Seppo Vartiainen +1 more | 1989-03-14 |
| 4625626 | Control/fire damper for ducts inventilation installations | Arvo Aalto, Erkki Aalto, Juhani Hasa, Markku Penttila, Harri Saukkonen | 1986-12-02 |
| 4190085 | Gas flow regulating and measuring apparatus | Juhani Hasa | 1980-02-26 |