Issued Patents All Time
Showing 76–100 of 102 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5552365 | Pressure-sensitive recording material which comprises natural oils and/or derivatives thereof | Gunter Klug, Jurgen Weisser | 1996-09-03 |
| 5502172 | Process for the preparation of pyrazole azo dyestuffs | Kerstin Pape | 1996-03-26 |
| 5446136 | Pyrazole azo dyestuffs | Kerstin Pape | 1995-08-29 |
| 5436323 | Cationic 1,3,4-thiadiazole dyestuffs | Werner Hartwich, Karl-Heinrich Lange | 1995-07-25 |
| 5425978 | Substrates secure against unauthorized copying and processes for their preparation | Uwe Claussen | 1995-06-20 |
| 5391748 | Dihydroquinolines | — | 1995-02-21 |
| 5328994 | Azinoneutromethines | Karin Hassenruck | 1994-07-12 |
| 5292881 | New naphthalimides, toners containing these and the use of the new naphthalimides as additives for toners | Horst Harnisch, Roderich Raue, Jurgen-Rolf Hassdenteufel, Matthias Kocher | 1994-03-08 |
| 5208325 | Cationic 1,3,4-thiadiazole dyestuffs | Klaus Leverenz | 1993-05-04 |
| 5178670 | Color former | Gunther Klug, Gert Jabs | 1993-01-12 |
| 5138070 | Pentamethine dyestuffs and derivatives | — | 1992-08-11 |
| 5118814 | Tetraindolyl-heptamethine derivatives | Hubertus Psaar, Gunter Klug | 1992-06-02 |
| 5092925 | Mixture of 3,1-benzoxazines and fluoranes | Gunter Klug, Gert Jabs | 1992-03-03 |
| 5024987 | Recording material | Gunter Klug, Gert Jabs, Artur Botta | 1991-06-18 |
| 5017707 | Tetraindolylheptamethine dyestuffs | Hubert Psaar, Gert Jabs | 1991-05-21 |
| 5013857 | Process for the preparation of sulpho-free triphenyl-methane dyestuffs | Roderich Raue | 1991-05-07 |
| 4968797 | Chromogenic 4,4-diaryldihydroquinazolones | Alfred Brack, Karlheinrich Meisel | 1990-11-06 |
| 4931567 | Bis(indolyl)ethylene compounds | Hubertus Psaar | 1990-06-05 |
| 4904637 | Recording material comprising chromogenic 3,1-benzoxazines | — | 1990-02-27 |
| 4897494 | Bis(indolyl)ethylene process | Hubertus Psaar | 1990-01-30 |
| 4849306 | Dry toners containing methinefanal pigments | Roderich Raue, Hubertus Psaar | 1989-07-18 |
| 4835270 | Chromogenic 3,1-benzoxazines | — | 1989-05-30 |
| 4831141 | Chromogenic 3,1-benzoxazines | Gert Jabs | 1989-05-16 |
| 4754034 | Chromogenic 4,4-diaryldihydroquinazolones | Alfred Brack, Karlheinrich Meisel | 1988-06-28 |
| 4727140 | Chromogenic 4,4-diaryl-2-oxobenzo-3,1-oxazines | Karlheinrich Meisel | 1988-02-23 |