Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4603976 | Optical mark recognition apparatus | Gunter Fetzer | 1986-08-05 |
| 4523251 | Electronic apparatus comprising an input stage with a binary output connected to a relay control circuit | Karl O. Buchholz, Hartmut Knappe | 1985-06-11 |
| 4486656 | Pulsed light barrier apparatus for direct connection to an a.c. supply | Fritz Kuhn | 1984-12-04 |
| 4339660 | Reflection light barrier apparatus for recognizing both strongly and weakly reflecting objects | Karl O. Buchholz, Gunter Fetzer | 1982-07-13 |
| 4291977 | Adjustment device for aligning a group of cyclically switched light transmitters or receivers with a single light receiver or transmitter | Walter von Stein | 1981-09-29 |