Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5552644 | Proximity switches | Douglas W. Calder | 1996-09-03 |
| 5463333 | Proximity switches | Douglas W. Calder | 1995-10-31 |
| 5463354 | Proximity switches including long tail pair with emitter follower feedback | Douglas W. Calder | 1995-10-31 |