Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6551391 | Aqueous ink and use thereof | Thomas J. Gerhardt, Georges Roussos | 2003-04-22 |
| 5771051 | Arrangement for monitoring functioning of an ink print head | Stephan Guenther | 1998-06-23 |
| 5449238 | Method for operating a recording device powered by at least one rechargeable accumulator | Ngoc Quyen Pham, Walter Eiler, Friedrich-Wilhelm Drees, Mohamed Al-Khatib | 1995-09-12 |
| 5365348 | Process for printing a halftone image | Friedrich-Wilhelm Drees, Raimund Nisius, Hartmut Grethen | 1994-11-15 |
| 5158929 | Inking ribbon | Ferdinand Quella, Oskar Nuyken, Hartmut Grethen, Barbara Dorner | 1992-10-27 |
| 4887092 | Thermal printing method | Ralf Kaiser, Hartmut Kirchhoff | 1989-12-12 |
| 4756633 | Inking ribbon including a sublimable release layer for color transfer under the influence of heat | Friedrich-Wilhelm Drees, Hartmut Grethen, Friedrich-Wilhelm Hagemeyer | 1988-07-12 |