Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE37777 | Switch apparatus requiring the hand of the operator to activate the switch by breaking a light beam | Mark C. Matzka | 2002-07-02 |
| 5367158 | Photoelectric switch for use with a machine control circuit | Mark C. Matzka | 1994-11-22 |
| D346587 | Contoured transparent cover for a photoelectric switch | Mark C. Matzka | 1994-05-03 |
| 4939358 | Switch apparatus including a pair of beam-type switches | Mark C. Matzka | 1990-07-03 |