Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5541403 | Method in an optically operated proximity switch | Ilkka Heinonen, Markku Hellsten | 1996-07-30 |
| 5444264 | Method for checking the working condition of an optically operated proximity switch | Ilkka Heinonen, Markku Hellsten | 1995-08-22 |