Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5616779 | Process for the preparation of 2,5-di-phenylamino-terephthalic acid and its dialkyl esters | — | 1997-04-01 |
| 5599992 | Process for the preparation of 2-fluorophenylhydrazine | — | 1997-02-04 |
| 5559257 | Process for the preparation of tetrachloro-1,4-benzoquinone | Wolfgang Tronich | 1996-09-24 |
| 5525744 | Process for the preparation of tetrachloro-1,4-benzoquinone | Hans H. Schubert | 1996-06-11 |
| 5451699 | Process for the preparation of crystalline, salt-free, chlorine-substituted 3-nitrobenzenesulfonic acid hydrates | — | 1995-09-19 |
| 5347038 | Process of the preparation of 2,5-di-phenylamino-terephthalic acid and its dialkyl esters in a high purity | Hermann Fuchs, Walter Gilb | 1994-09-13 |
| 5208365 | Process for the preparation of 2,5-di(phenylamino)-terephthalic acid and its dialkyl esters in high purity | Hermann Fuchs, Walter Gilb | 1993-05-04 |
| 5151532 | Process for the production of high-purity tetrachloro-1,4-benzoquinone | Theodor Papenfuhs | 1992-09-29 |
| 5149850 | Process for the production of high-purity tetrachloro-1,4-benzoquinone | Theodor Papenfuhs | 1992-09-22 |
| 4908478 | Single-vessel process for preparing 2-acetaminonaphthalene-6-sulfonic acid of high purity | Theodor Papenfuhs | 1990-03-13 |
| 4824962 | Process for the preparation of naphthostyril | Theodor Papenfuhs | 1989-04-25 |
| 4658034 | Process for the preparation of 2,6-dichlorobenzoxazole | Theodor Papenfuhs | 1987-04-14 |
| 4613698 | Process for the preparation of 6-chloro-2,4-dinitroaniline | Theodor Papenfuhs | 1986-09-23 |
| 4605767 | Process for the preparation of 2,6-dichloro-4-nitroaniline | Theodor Papenfuhs | 1986-08-12 |
| 4552970 | Solvated salts of dinitrophenylcyanamides, and a process for the preparation thereof | Theodor Papenfuhs, Wolfgang Tronich | 1985-11-12 |
| 4540832 | Process for the preparation of 6-chloro-2,4-dinitrophenol | Theodor Papenfuhs | 1985-09-10 |
| 4487725 | Process for the preparation of N-acetylaminoarylsulfonic acids in sulfuric acid as solvent | Theodor Papenfuhs | 1984-12-11 |
| 4316861 | N-Nitroaryl-N-halosulfonyl ureas | Wolfgang Tronich | 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 | Wolfgang Tronich | 1981-03-03 |
| 4246196 | Diaminophenyl ureas | Theodor Papenfuhs, Peter Bohme, Wolfgang Tronich, Bernhard Mees | 1981-01-20 |
| D257785 | Receiver for a golf ball chipping game | James J. Arndt | 1981-01-06 |
| 4242275 | Process for the preparation of isomer-free toluene-4-sulfonic acid | Bernhard Mees | 1980-12-30 |