Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4939012 | Naphtholactam dyes and optical recording medium containing these dyes | Matthias Dust, Peter Neumann, Ernst Schefczik, Heidi Benthack-Thoms, Helmut Barzynski +2 more | 1990-07-03 |
| 4876356 | Naphtholactam dyes and optical recording medium containing these days | Matthias Dust, Peter Neumann, Ernst Schefczik, Heidi Benthack-Thoms, Helmut Barzynski +2 more | 1989-10-24 |
| 4668586 | Magnetic recording media | Albert Kohl, Milena Melzer, August Lehner, Norbert Schneider, Werner Balz +2 more | 1987-05-26 |
| 4656548 | Tape cassette containing echo-erasing means | Dietmar Pfefferkorn, Gerhard Nerschbach, Norbert Kreimes, Bozidar Pavelka | 1987-04-07 |
| 4567108 | Magnetic recording media | August Lehner, Helmut Kopke, Hermann Roller, Werner Balz, Werner Grau +1 more | 1986-01-28 |
| 4497723 | Preparation of acicular, ferrimagnetic iron oxides | Manfred Ohlinger, Guenter Vaeth, Peter Rudolf, Wilhelm Sarnecki, Helmut Jakusch +1 more | 1985-02-05 |
| 4472455 | Production of magnetic recording media | Albert Kohl, Werner Balz, Milena Melzer, Norbert Schneider, August Lehner | 1984-09-18 |
| 4453683 | Magnetic tape cassette arrangements | Karl-Juergen Reimer, Dietmar Pfefferkorn, Norbert Kreimes, Wilhelmus Andriessen, Herbert Wagner +1 more | 1984-06-12 |
| 4438462 | Document identification employing exchange-anisotropic magnetic material | Joachim Hack, Manfred Steuerwald | 1984-03-20 |
| 4430362 | Production of magnetic recording media | Milena Melzer, Norbert Schneider, Helmut Kopke, Klaus Schoettle, Werner Balz +1 more | 1984-02-07 |
| 4423454 | Magnetic recording disk | Peter Felleisen, Dieter Mayer, Friedrich Domas, Paul Deigner | 1983-12-27 |
| 4420330 | Stabilization of pyrophoric ferromagnetic acicular metal particles consisting essentially of iron | Helmut Jakusch, Werner Loeser, Peter Rudolf, Werner Senkpiel, Werner Steck | 1983-12-13 |
| 4414287 | Magnetic recording medium and its manufacture | Eckhart Kneller, Roland Koenig, Werner Grau, Dieter Mayer | 1983-11-08 |
| 4396886 | Document authentication by means of exchange-anisotropic magnetic material | Joachim Hack, Manfred Steuerwald | 1983-08-02 |
| 4382244 | Device for magnetically orienting the magnetizable particles or magnetic recording media in a preferred direction | Paul Deigner, Dieter Schaefer, Karl Uhl, Roland Falk | 1983-05-03 |
| 4287225 | Process of making a magnetic recording medium | Eckhart Kneller, Roland Koenig, Werner Grau, Dieter Mayer | 1981-09-01 |
| 4287233 | Manufacture of acicular cobalt-containing magnetic iron oxide | Peter Rudolf, Werner Steck, Manfred Ohlinger, Christof Jaeckh | 1981-09-01 |
| 4221776 | Manufacture of acicular ferrimagnetic iron oxides | Horst Autzen, Helmut Jakusch, Werner Loeser, Peter Rudolf, Wilhelm Sarnecki +1 more | 1980-09-09 |
| 4213222 | Cleaning apparatus for a web of plastics film having a magnetic coating | Klaus Schoettle, Peter Dobler, Helmut Lewin | 1980-07-22 |
| 4213959 | Manufacture of acicular, ferrimagnetic iron oxide | Rudolf Brodt, Helmut Jakusch, Werner Loeser, Manfred Ohlinger, Wilhelm Sarnecki +1 more | 1980-07-22 |
| 4201149 | Apparatus for spin coating in the production of thin magnetic layers for magnetic discs | Paul Deigner, Roland Falk, Karl Uhl, Dieter Schaefer, Dieter Mayer +2 more | 1980-05-06 |
| 4201486 | Process for the manufacture of magnetic recording media | Werner Huebner, Job-Werner Hartmann, Friedrich Domas, Peter Nagel, Paul Deigner +1 more | 1980-05-06 |
| 4188302 | Manufacture of acicular cobalt-modified magnetic iron oxide | Hans-Juergen Becker, Christof Jaeckh, Werner Loeser, Manfred Ohlinger, Werner Steck | 1980-02-12 |