Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5559257 | Process for the preparation of tetrachloro-1,4-benzoquinone | Otto Arndt | 1996-09-24 |
| 5539114 | Process for the preparation of substituted quinazoline-2,4,-diones | Robert Cosmo | 1996-07-23 |
| 5446190 | Process for the preparation of alkyl fluorobenzoates in high purity and high yield | Gilbert Billeb | 1995-08-29 |
| 5292932 | Process for the preparation of 5-chloro-2-hydroxy-4-alkyl-benzenesulfonic acids | Carl-Stephan Frohlich, Gunther Sell | 1994-03-08 |
| 5136043 | Process for the preparation of aromatic sulfonyl chlorides | Michael Meier | 1992-08-04 |
| 4990673 | Process for the preparation of 4,4'-dinitrodiphenylamine | Peter Hess | 1991-02-05 |
| 4552970 | Solvated salts of dinitrophenylcyanamides, and a process for the preparation thereof | Otto Arndt, Theodor Papenfuhs | 1985-11-12 |
| 4507491 | Process for preparing 1-nitrobenzene-2-alkyloxycarbonyl-5-carboxylic acids | Werner Wykypiel | 1985-03-26 |
| 4410707 | Process for the manufacture of 3-amino-1-phenylpyrazol-5-one | Wolfgang Rieper, Peter Bohme | 1983-10-18 |
| 4316861 | N-Nitroaryl-N-halosulfonyl ureas | Otto Arndt | 1982-02-23 |
| 4254054 | Process for the manufacture of 4-nitro-4'-amino-diphenylamine-2-sulfonic acid and 2-nitro-4'-amino-diphenylamine-4-sulfonic acid | Otto Arndt | 1981-03-03 |
| 4246196 | Diaminophenyl ureas | Otto Arndt, Theodor Papenfuhs, Peter Bohme, Bernhard Mees | 1981-01-20 |
| 4224222 | Process for preparing copper phthalocyanine pigments of the .alpha.-modification | Ernst Spietschka, Siegfried Schiessler | 1980-09-23 |