Issued Patents All Time
Showing 76–100 of 154 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4934953 | Junction box for electrical cables | Horst-Helmut Tenham, Dieter Jaag | 1990-06-19 |
| 4925888 | Mixture for stabilizing polyurethanes | Alexander Aumueller, Peter Spang, Guenter Matzke, Hubert Trauth | 1990-05-15 |
| 4924003 | Pyrazoline compounds | Reinhold J. Leyrer | 1990-05-08 |
| 4922031 | Preparation of 4,4'-dihydroxybiphenyl | Ulrich Eichenauer | 1990-05-01 |
| 4911732 | Light fastness of polyester dyeings using benzophenone ether esters, and novel benzophenone ether esters | Dieter Wegerle, Reinhold Krallmann | 1990-03-27 |
| 4909782 | Tissue punch | Horst K. Semm | 1990-03-20 |
| 4908448 | 4-Quinazolone compounds | Reinhard Aldag, Andreas Boettcher, Thomas Bluemel, Friedrich Seitz | 1990-03-13 |
| 4906541 | Electrophotographic recording element containing a naphtholactam dye sensitizer | Matthias Dust, Reinhold J. Leyrer | 1990-03-06 |
| 4904779 | Heterocycles based on piperazinopiperazine | Alexander Aumueller, Hubert Trauth | 1990-02-27 |
| 4904566 | Optical recording medium containing an azulenium dye | Wolfgang Schrott, Bernhard Albert, Heidi Benthack-Thoms | 1990-02-27 |
| 4897289 | Production of an electrically conductive surface layer on moldings consisting of plastics | Alexander Aumueller, Gerd Blinne, Gerhard Lindenschmidt | 1990-01-30 |
| 4894483 | Preparation of vinylglyoxal derivatives, novel vinylglyoxal derivatives and their use | Hans-Dieter Martin, Roland Kramme, Ralf T. Weimann | 1990-01-16 |
| 4894313 | Photosensitive recording element comprising migration resistant dyes | Guenter Wallbillich | 1990-01-16 |
| 4891301 | Photopolymerizable recording materials, photoresist layers and lithographic printing plates based theron, and novel 4-quinazolone compounds | Reinhard Aldag, Andreas Boettcher, Thomas Bluemel, Friedrich Seitz | 1990-01-02 |
| 4885396 | Process for the preparation of 2-hydroxy-4-(2'-hydroxyethoxy) benzophenones | Erwin Hahn | 1989-12-05 |
| 4883732 | Method of forming printing plate using isoindolenine deratives | Reinhold J. Leyrer | 1989-11-28 |
| 4880718 | Electrophotographic recording element with isoindolenine derivatives | Reinhold J. Leyrer | 1989-11-14 |
| 4876356 | Naphtholactam dyes and optical recording medium containing these days | Matthias Dust, Ernst Schefczik, Heidi Benthack-Thoms, Helmut Barzynski, Klaus D. Schomann +2 more | 1989-10-24 |
| 4873372 | Isolation of 4,4'-dichlorodiphenyl sulfone | Gerhard Schaefer, Heinz Eilingsfeld, Michael Stumpp | 1989-10-10 |
| 4871876 | Preparation of 4,4' dichlorodiphenyl sulfone | Gerhard Schaefer | 1989-10-03 |
| 4865762 | Polymers which form liquid-crystalline phases | Willi Kreuder, Karl-Heinz Etzbach, Hans-Josef Sterzel, Helmut Ringsdorf | 1989-09-12 |
| 4851549 | Pigments | Helmut Flohr, Joachim Jesse, Bernhard Albert | 1989-07-25 |
| 4835273 | Glycoluril derivatives | Alexander Aumueller, Hubert Trauth | 1989-05-30 |
| 4830951 | Naphtholactamsquaric acid dyes and optical recording materials containing these dyes | Matthias Dust, Peter Hauser, Gerhard Wagenblast, Heidi Benthack-Thoms, Helmut Barzynski +2 more | 1989-05-16 |
| 4829509 | Optical recording medium, its preparation and its use as a read only memory information carrier | Wolfgang Schrott, Peter Hauser, Gerhard Wagenblast | 1989-05-09 |