Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4894850 | X-ray apparatus for slit radiography | Gottfried Frings, Walter Hillen | 1990-01-16 |
| 4760342 | Electrostatic induction probe arrangement using several probes | Josef N. Conrads, Walter Hillen, Peter Quadflieg | 1988-07-26 |
| 4752944 | Method and apparatus for producing an X-ray image by means of a photoconductor | Norbert Conrads, Walter Hillen, Peter Quadflieg | 1988-06-21 |
| 4635072 | Printing apparatus and methods for compensating synchronization errors | Norbert Conrads, Rolf Kirchhoff | 1987-01-06 |
| 4571604 | Method of and device for the electrophotographic printing of information | — | 1986-02-18 |
| 4389610 | Electrostatic probe device and method of manufacturing such a device | Dieter Wadow | 1983-06-21 |