Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4627498 | Fuse design for fire limiters or other safety appliances in ventilation installations | Erkki Aalto, Juhani Hasa | 1986-12-09 |
| 4625626 | Control/fire damper for ducts inventilation installations | Arvo Aalto, Erkki Aalto, Juhani Hasa, Markku Penttila, Arvi Tolmunen | 1986-12-02 |